Inconvenient Mounting Hole Locations
584919
The locations of the mounting holes make it difficult to use a drill (unless you have a really long extension for your drill bit).  Aside from the mounting holes, this product is a great value for the price.  However, I would suggest looking at Lyman's next models up the chain before purchasing.

Make sure you're trimming quality brass. I tried some once-fired Federal Gold Match (FC head stamp), and the rim thickness variation was unbelievable.  This trimmer controls the overall length from the rim, so rim thickness variation is important. The Federal brass was giving me +/- 0.004". After switching to Lapua, I was achieving +/- 0.0005".
915008
Does not fit at all alignment of screw hole and clips are not even close to the correct location
3522536
I bought this shelf to replace a worn out one under the the sink in the bathroom vanity. The shelf is very well constructed but has too many mounting points, located on multiple tabs at 90 degrees to the mounting direction; each tab has two holes, one outside and one inside of the roller frame. The outer holes are impossible to reach if the shelf is close to a cabinet divider and the inner holes are partially blocked by the rolling shelf itself, making it very difficult to start the mounting screws. It took far to long and too much effort to install this shelf. Also, switching sides for the upper shelf requires partial disassembly so you had better do it before installing the whole unit.
2795900
I used the provided screws and plastic backing plates, but as for the two extra holes remaining I used a couple pop rivets with metal backing washers.  It's now a pretty secure mount.  This was all mounted on the back of a Bontrager rack that is on my Terratrike Rambler.  I used the provided security screw and washer to deter the light from being 'easily' taken off. Perhaps using a star screw instead of the hillips screw would be a better deterent.  How many people walk around with a star screwdriver?
1307890
The product is well-designed, with one very major problem -- the mounting bar is only 23 1/2" wide.  This is okay if you have an older home with 16" stud spacing on your walls (the pairs of pre-drilled mounting holes accommodate 16" spacing), but much modern residential construction has studs 24" on center.  To use my unit, I had to use a drill press to make new holes at the extreme ends of the mounting bar, and then angle long deck screws into the studs.  It worked, but this was far from an ideal installation.
2282196
Warning to people purchasing this product, the threaded holes on the side of the adapter do not use standard 3.5" drive screws. Many brackets (including this one) have M3 holes on the sides of the tray. This is incorrect! While a 2.5" drive uses M3 screws for mounting, the adapter bracket should use #6-32, as if it was a 3.5" drive. That's why you want the adapter tray. Right? If you have a computer case that is tool-less or have special mounting screws, you could run into a problem.

Others have commented that this heavy duty.  Yes, it is.
Others have commented that it is painted well. Yes, it is.
2717402
Lack of screw mounting holes is a major flaw in my opinion, other than that it appears to work fine. I have mounted it with the two sided sticky tape provided by the manufacturer. Now will see how long it holds.
411710
I really like the large Condiment Basket! I do not understand why the hooks don't cover the mounting holes on the side of my grill. I have three more screw holes showing and there's really no decent way to mount these hooks without it looking shabby. I purchased a Magnet Gear Trax to hopefully fill in the space left but the Magnet strip is too big and three Gear Trax will not fit on the same side with the mounting option provided. Pretty lame, sure now i have hooks on the side but I probably could have found something equally as useful and ugly as the Gear Trax to hang a spatula or tongs from. Who designed this? They didn't notice that there was a gap left over? Really?? Look at the picture I uploaded, there is no way to mount these and make these look right.
4208235
My fault I suppose for ordering it but its silly that some holes are threaded and some arent.  renders it only able to be mounted in a very limited number of ways.
4733258
These lights look good, but the mounting plate is a very stupid design that makes it difficult or impossible to install snugly against the ceiling.

The mounting plate seems to be designed to fit flush to the ceiling, but it's narrower than most ceiling light holes, and junction boxes tend to be slightly recessed. This combined with the fact that the screws from the mounting plate are just BARELY long enough to fasten the canopy to the plate means you can't have the mounting plate fastened and get the light attached.

UPDATE: So I bought 4 of these lights, and installing each one was varying levels of frustrating, depending on how recessed the junction box is. Two of the installs had me angrily swearing at the people who designed this light. I recommend switching the screws they give you. There are 4 included (and a ground screw on the plate). The 2 screws meant to attach the light canopy to the mounting plate come screwed into the mounting plate with nuts and a screw cap already on. Take those out, and put the screws that come in the bag in their place, don't put the nuts back. These screws are a touch longer, which makes all the difference in the world. Use the screws you took out to attach the plate to the junction box. Putting the nuts on these screws (loosely) before doing this will add another few precious millimeters when its time to put the screw caps on. Good luck
4335068
well designed but somewhat flimsy. Also being able to reach the screw holes to mount it is difficult
4415324
Product seems  to function as advertised.  Delivery was prompt.
The design of the mounting brackets make installation extremely difficult.  The screw holes are blocked by the equipment and the screws of the swivel mount for the light head cannot be tightened enough to hold it firmly in place.  Do not know if this last issue is a real problem since it does seem unlikely that wind will blow hard enough to move the light.
4705900
I have a 2002 Yamaha V-Star 1100 Classic with the OEM backrest on the rear seat.  If I had installed this using the existing mounting holes in this luggage rack it would have had an approximately 20 degree forward slope to it and looked like something more befitting a crotch rocket than a cruiser, and would have been useless for all practical purposes at that angle (IMHO).  I give this product 3 stars for being a decent looking, sturdy rack, having deducted 2 stars for poor fit and having to make my own modifications for a proper fit.

Rather than mess with returns, I mounted it using just the top mounting holes, adjusted the rack until it was in line with the back seat, tightened the mounting screws to keep it from moving, then used a spring loaded center punch inserted through the lower bolt holes to set the location of where I needed to drill out the lower mounting holes.  I then removed the rack and using a hand drill, and a small bit to avoid (as much as possible) having the bit wander, I drilled a hole from the inside face of the mounting arm (where the center punch mark was) completely through the arm.  Unless you have a right angle drill head, you're not going to get a dead straight hole.  But considering the thickness of the material and the fact that this wasn't a NASA project, a slightly off-axis hole would suffice.  To keep it as close as possible without having to overdrill the size of the hole or have to use washers to cover up a blown out hole, try to keep that drill bit in the center punch divot.  Once the initial hole was drilled, I then used progressively larger bits, drilling from the external face, through the mounting arm until I reached a hole size that was about the same size as the holes that existed in the rack.  The important thing is that the bolt can fit through it.  I then deburred the holes with a deburring tool and some Emory abrasive cloth (being careful not to mar the chrome finish on the outer surface), then mounted it up.  After the modification, the original bottom mounting hole is exposed and just forward of the new mounting hole.  Since the inside of that hole was chrome plated, I didn't think it would be a problem and, while it's not ideal, it's not hideous and is functional for my purposes.

If I can figure out how to upload a couple of pictures with this review, you'll be able to see the finished result and decide if the price and effort is worth it to you.

Update 8/4/13:  I posted a couple of pictures but they are associated with the product, not this review.
4052234
The mounts are nice, and blend in well, however I did have two small issues.  First, I had to take the speaker bracket part off first to install the mount to the wall.  This was a small problem because t was a pain to but the speaker bracket back on once the mount was installed.  After fiddling with each for a while I was able to get it, however, it just seemed more aggravating then need be, the mount hole locations for attaching to the wall could have been designed differently to prevent this annoyance.  The second issue I had was that the included speaker mounting bolt did not fit into either of my speaker sets screw in fitting.  Luckily I did have fasteners that would fit but these fasteners were slightly to wide in diameter to fit through the slot on the speaker bracket.  This was easily solved by using the drill to slightly ream the slots to fit the fasteners.  Once again this was a slight annoyance, one that could have been prevented with a slightly better design, but it was easily worked around.  All in all  for the price, I would still recommend these mounts, just know you might have a few slight aggravation so installing them.
1877329
We purchased 2 Kraus Aura towel bars for our recent master bath rennovation.  Admittedly, I liked the look and feel of the fixture and I wasn't able to find any photos of the mounting brackets, screws, etc.  We've always hung our own towel bars, EMTEK, Restoration hardware, Delta, Moen, and now Kraus.  Restoration Hardware mounting hardware is pretty awful, but we discovered Kraus mounting hardware is even worse.

The problem with this is the mounting bracket (see photo)
1. Screw holes are just 3/4" apart,
2. There are only 2 holes,
3. Junky plastic anchors,
4. The holes are HORIZONTAL only, with no vertical support.
5. Note:  the mounting bracket in the instructions looks slightly different than the hardware we received with the package.
6. No mounting template for the DIYer.

I've posted photos of the mounting hardware and installation instructions.  Hope this helps someone out there avoid what we just went through last Saturday.  Plus, now we have lovely drywall holes and damage to repair now.  Grrrr...

Details:
Each mounting bracket has only 2 horizontal holes about 3/4" apart.  The included anchors are the cheapest plastic anchors you can find.  We knew we were in for a struggle, but we liked the towel bar, so we gave it a shot.  We tried a couple of the plastic anchors - but they proved to be as junky as they looked.  So off to Home Depot for metal threaded anchors.  Because we'd already tried the plastic anchors, we went with slightly larger metal anchors.  We also grabbed a couple of Togglers from Lowe's.

Because the holes in the mounting bracket are so close to each other, the Toggler's are too large for the bracket, so we went with the metal threaded drywall anchors.

Once, we mounted the brackets securely, we used the included wrench to tighten the towel bar to each of the mounts.  Both towel bars tipped forward on their puny little mounting brackets - even without any towels.  They were "secure" but they rattled and moved on the mounts with the slightest touch.  We removed the towel bars and checked the mounts were secure, but they have the slightest tendency to learn forward.  We believe this is because they have no vertical support.  We remounted the towel bars, same problem.  These are both going back.

We did (briefly) consider drilling holes into the mounting hardware, but (1) the mounting bracket is very small, (2) resulting in the screws being too close to each other, (3) which will cause issues with the drywall integrity, and (4) it's much easier to return this crappy towel bar we've come to hate and just search for another one with a more thoughtfully engineered mounting bracket.

So, we'll need to repair the drywall holes we made attempting to install the terrible Kraus mounting brackets.  I will never attempt to install a bracket this poorly engineered again.  The time and frustration is just not worth it.

BTW:  We selected the EMTEK Modern Bath Hardware - and were very pleased with the very thoughtfully designed mounting hardware, three hole mounting bracket and a POST, including metal threaded anchors and gaskets.  Installation was a snap, though I wish EMTEK would include a template for their towel bars.  We also picked up the EMTEK robe hooks, toilet paper roll holder and towel rings.
4439097
U have to put it in  just  the  right  place  which  is  so  inconvenience
2917648
Would it kill you to put some mounting instructions in the box?