If you have a FolgerTech FT-5, these really should ...
587593
If you have a FolgerTech FT-5, these really should be included with the kit.  Simple to install (search for Fugatech's video on YouTube) and quite reliable.  The MKS board included with the FT-5 really can't handle bed heating and installation of this just saves you from the worry of the board connectors going *poof*.  There's countless threads in the Facebook group about this happening and some just solder the wires directly to the board.  I really didn't want to put my soldering skills to that level of testing, so this MOSFET works really well.  I used the fan that came with the FT-5 kit (for cooling the electronics bay) on this...I sincerely doubt this beast of a heatsink needs the cooling...but why not?  Works well for my setup!
537629
They are a little bit harder to use than the factory ones, even though they are the same size. They work, though, with a little elbow grease. Or maybe I'm doing it wrong? *shrug*
3948308
I wasn't too sure about these when I got them but they are great.  I make a bunch up ahead of time.

A few tips:
Be sure to use the hard plastic sleeve included in the box.  Otherwise, they get crushed when you try to put the cover on.

I know some other people have had trouble with them getting caught when they lift up the handle.  This happens because these are a little thicker than the pre-filled ones and you need to be sure you push all the way down.  If it gets caught, don't try to pull it out.  Just push the handle down again.

I didn't like the way the filter paper sticks out over the top of the cup when I first saw these.  I was afraid coffee would leach out and gunk up my brewer.  It doesn't.

Now, if they would just make them recyclable or biodegradeable.....
3180726
I bought these directly from the seller because with all I was buying from them it was actually less expensive with shipping and all.

I have only one real complaint about these spouts. They are long and do not have a bend or "crook" built in to them. So you have to have one hand on the spout to bend it in to the opening and one hand (arm in the case of a 5 gallon) on the can for tilting. This make it somewhat difficult to pour in in many cases, especially in to small engines.

Otherwise the product is as advertised. I bought both the regular and Hi-Flo versions along with vent assemblies for all my cans that didn't have them.

Update!: The Hi-Flo version of these spouts will not fit in the hole of a vehicle gas fill inlet. When pouring in to a vehicle gas inlet, you need to be able to insert the spot into the smaller hole or flapper hole a couple inches down from the top just like when you use a gas pump. If you don't, you either have to pour very slowly or you will gush fuel all over. The Hi-Flo version of this spout does not fit in the hole that a gas pump nozzle will so it's useless for vehicles.

If you have modern cans, they have eliminated the vent and built it in to the nozzle itself. While some designs of the new spouts are helpful like hooking the spout on to the gas tank opening and pushing to pour (this can reduce spillage in some cases), the brainiacs who came up with the safety standard ignored that you may be pouring in to a small gas tank or even transferring gas from a large to a small can. The vents allow you to control how you pour.

Some of the new can's spout designs are just stupid, some are not too bad. I keep some as is and have converted others so I have both options. I have at least 10 gas cans.

Good product. Shame on my state for not allowing these to be sold/shipped to me. It's my life and my gas, get out of my shed big government! Fortunately I had a way around this restriction of my freedom and can now manage my gas as I see fit like the grownup I am.
758989
These fit tubes that have removable presta cores, so you need to be sure your tubes are compatible.  My preferred brand of tube, Schwalbe have replaceable cores and these fit them perfectly.  Use of a tool, either the Park tool,&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Park-Tool-Valve-Core-Remover/dp/B005Z4LVG8/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Park Tool Valve Core Remover</a>&nbsp;or the Origin8 tool,&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Origin8-Presta-Valve-Core-Remover/dp/B00OVKBXLU/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Origin8 Presta Valve Core Remover</a>, or, if in a bind a 4mm open end wrench, will be required.

Note that these do not include the tube caps, which you should have.  You did not lose the cap, right?
1504489
Easy to order these through Amazon, for sure, and much cheaper than the Jet.  My jointer is a Jet JJ-6CSX.  The Freud blades are thicker than the factory blades, and required that the gib screw head be flattened a bit prior to installing the blades.  No biggie (a quick trip to the disc sander and Tormek), but the blades won't fit otherwise, at least on my set up.  I also honed the burr off the back on an 8000x Norton waterstone.  Haven't had them on long enough to tell about wear, etc., but I would assume they would be at least as good as the original product.
2107744
These would not work for me with FAT32. But once I reformatted with either exFAT or NTSF they work just fine. I wanted to hang a tag off them but the string on the Avery label tags that I purchased would not fit through the hole. So I had to put the label string through the swivel cap. Not ideal but it will work ok.

I have not used these for any length of time so I cannot vouch for longevity.
2279938
At first I didn't think it worked, but then I realized I just had to get REALLY close to the subject (like an inch or two.)  They work on a 50mm F1.8 and a 35mm F2, but not on the 17-85mm F4-5.6.  Check compatibility before buying.

I'd update my rating to 4 stars.
1682431
I just want to reemphasize to anyone looking that these DO NOT fit the 3.0 oz, 2.6-inch diameter Fancy Feast cans.  Nowhere close.
I could have sworn that there were reviews telling me that they worked for those cans, but now I see in the Q&A that they do not.  It seems it is the other ones that cost almost $7.  That seemed like a lot for 3 lids, and the price seemed about right for these, so I guess I clicked on the wrong ones.  I will see if I can use them for anything else, since it's hardly worth returning them, being my mistake.  Aluminum foil will have to continue to work for a while now!
So how many stars?  It does work beautifully on a 5.0 oz tuna can, so better give it at least 4.  It's not their fault I bought the wrong one.
2328858
I bought these to use with my Keurig B60, and they work beautifully.  If, every now and then, they won't lock on to the previously used and cleaned K cup, that's okay.  Just place the K cup with the K saver on top and carefully put it into the machine and they still work! Like Starbuck's coffee?  Buy the large bags, grind your own and use these.  SB K-cups are ridiculously more $$, than other varieties-save lots using these instead.
Edited 1-18-2012:  I bought these a month ago for 14.99, and was thinking about buying another set.  But a $5.00 price increase???? That is crazy! They probably cost 2.00 or less to make a set of 5.  Why a 25% price increase???
275317
Perfectly fit the TN-115 high-yield cartridges and stopped the toner from leaking out when the cartridge was tilted to one side. I should have gotten these from the outset when I got a refill kit, but didn't realize how poorly the OEM seals fit after you remove them. These are an absolute must.
3651056
These work well and keep the tap nozzle fresh.

They're too big if you're trying to use a tap faucet lock though.  The lock won't fit over them.

If that's helpful to ONE customer out of a thousand, I'll be happy. :-)
2685595
These fit. I presume they are doing a good job of what furnace filters do, but it is nice to be able to order this difficult-to-find size so easily through amazon. The real question here is WHY, WHY, WHY do furnace manufacturers build furnaces with such odd-sized filters??? They must have been talking to the folks who have created different types of dryer plugs. I really hate these people. They should be the first up against the wall when the revolution comes. Thank you, amazon for making my life a little easier.
2119498
Highly recommended, but beware when using with a lifted F250. Firestone recommends spacers equal to the block height but mine didn't fit with them. A lot of research and removal of the spacers fixed the issue, but they lose a star for the hassle.
2751688
I bought the wrong item and I still like them.  I have a different drinkwell and these do not really fit but I scrunched it around my filter that was clogging every week in its old age.  Now it has been over a month with no clogs.  Works great.  Now I am just thinking if it doesn't need to be shaped perfectly if I could get away a lot cheaper cutting my own foam pieces.  These are quite pricey for how many you get, hence the 4 stars.  Still worth it if you don't want to DIY.
785075
My husband uses these for brewing beer.  He takes them to a local spring and fills them up - they work perfectly.
4409119
I originally had some old kruxs on my 8in deck I had before. I moved up to an 8.5in deck so the 7.75in trucks felt weird and didn't tuen properly. Once i bought these since they're 8.5 it fits my deck perfectly and performs normally. Don't forget to buy 2 trucks since they are sold singularly. Keep shredding!