Great lock- happy with purchase but used in conjunction with a pin lock
595170
Used in conjunction with the Master Coupler Latch Lock-Solid Brass Trailer Lock. I wanted double security on my brand new pop-up tent camper.
Obviously if someone really wanted to steal your camper they can bring the right equipment to bust your locks... I used both locks together to deter even motivated thieves.

I liked this lock design because it is very difficult to get a bolt/lock cutter on it, is a very robust lock and you would ultimately have to bust the locking mechanism/pin or pick the lock to get it opened. There is no busting or cutting through the metal. Using this lock in tandem with the Brass trailer lock listed above... this is a pretty good ~$40 in trailer locks that is a decent alternative to spending $100 on a full wheel lock.
634827
This lock was perfect for my application. In the condo you need a fob for the elevators and recreation deck. I was able to program the lock to accept the same fob for entry. I had an mechanical issue several months later, and they immediately sent out a replacement lock. Aside from that the lock is well built and has a solid feel.
47197
This is a good quality lock, but be warned the numbers can be a bit finicky! This caused a bit of a panic moment until I could get the numbers EXACTLY where they needed to be in order for the lock to open. Overall, I am happy with this lock and love the bright green color!
3519662
I love this door lock.  It is much better than the limited other types on the market.  The only problem is that it is not obvious that it is a door lock as it is flush when not being used and it is on the inside of the door rather than the traditional spot on the outside.. I little education of guests takes care of that.  You do have to be careful to place it as close tot he strike plate as possible.  The door will open until the pivot plate hits the strike plate.  This could allow the door to open slightly if the two are too far apart.
3211885
lock holder that fits on bike is a little clunky. but overall, very secure and very easy to use. very happy with this purchase. cable adds security and is a nice add-on
492260
This is a great lock, but there are two things you need to know before buying it. Before I get into that, this lock is solidly built, and great for "average" security (i.e. keeping honest people out of something, otherwise it's just a deterrent, like most locks of this type). It comes with a code change key, so you can reset the combination. Some reviewers have complained that they didn't get a code change key, and that's probably because it fell out of the box--the packaging is a simple box that the flat little key is thrown into loose, and I can see it could easily slide out of the box in handling in a warehouse somewhere. Master should do a better job packaging the key, perhaps sticking it onto the included instructions with adhesive or similar. I ordered two locks and both work smoothly (and the code change keys were in the boxes), and changing the combination is easy. An override key, purchased separately, allows you to open the lock without knowing the combination. This ability is the main reason I bought this 176 model lock.

The first thing you need to know is that you have to push the code change key in before turning it--if you don't push it in, it won't turn, and you may be tempted to use some force the first time you try. I found out that the flimsy key bends easily. Fortunately, it bends back easily, too. But if you push first, then turn, it turns easily and there's no risk of damaging the key. So PUSH, then TURN.

The second thing, and this is REALLY important, is that you must purchase the override key (to open without using the combination) separately, and there are multiple different override keys for this model 176 lock. Amazon makes no effort to match the override key to the lock they are shipping you. So, I bought two override keys, per Amazon's recommendation (and a description match for the 176 model), but they are incorrectly ground for the locks Amazon shipped. You see, when you get your lock, the box is labeled with the serial number of the correct override key for that lock (maybe k7-P380, K7-P136, etc.). You need to make sure that you order the right one for the lock you have gotten, and since Amazon won't match it, and you have no idea which key you actually need until you get the lock and can read the label, DO NOT ORDER OVERRIDE KEYS AT THE TIME THAT YOU ORDER THE LOCKS. Order the lock(s) first, wait until they show up, and then look at the boxes to see which override key(s) you'll need, then order those in a second order, once you know which keys you really need.

I gave the lock four stars out of five. I'm knocking them one star for poor packaging of the code change key and the poor quality of that key. I can't knock the lock for the override key issue, that's just buyer experience, and I can't knock Amazon, because they shipped me what I ordered--I don't expect them to know I wanted matched keys.
360101
Very nice lock. I have 4 and am very pleased. The problem you may encounter is having additional keys made. Many stores don't realize that they have the appropriate blank. If your key counter has a Hillman rotating, blank display, tell them to use blank #95. It will work perfectly but when you match it up to an original key, you will notice that one of the original stops or shoulders extends a bit more towards the point. Take a small file and in 20 seconds you can file that shoulder higher, allowing the key to penetrate the lock perfectly. Now for the financially flushed amongst us, a quality locksmith might/should/will even have Stanley, black shrouded blank available. I think I even saw them on Amazon but blanks are usually sold in large quantities. Again, a nice lock and very intimidating in appearance.
2507476
I've had this lock for about four months now and use it almost daily.  I came across a few minor issues but found fixes for them.  Overall, I'm really glad I got this model.  Would-be thieves in Oakland have so far not tried anything on my bike, though I have been careful to not lock it up outside overnight.  Also, I try to lock it up somewhere near lots of windows, cars, and/or people such as in front of a restaurant or bar.

Like other reviewers have noted, this won't fit neatly into the space where your water bottle would attach unless you have a large frame.  So instead, I've attached it to the shaft that holds my handlebar (pardon my lack of bike vocab) and this seems to work just fine (see photo that I uploaded).  It takes some time to get it adjusted just right so that it doesn't move or hit the handlebars.

My second issue was that the lock itself would rattle when riding over anything larger than a bump in the road.  To fix this, I wrapped 1/4-1/2" strips of electrical tape around each end of the U bar a few times so that when it connects into the thick lock bar, there is a snug fit.  Because of this you have to pull the U piece and the lock bar together slightly when locking and unlocking to get the lock to turn.  You can sort of see this in my photo, but it's subtle and hard to notice.

So, with the lock set up like this, I have had zero problems!  My key has never been stuck and I haven't had much difficulty removing the lock from the mounting bracket.  I'm glad I got the 9" model as it often just barely has enough room with my mountain bike--I think the mini model would be frustrating to find a place to lock up with.  Finally, you only need to lock up the back tire from within the frame to the bike rack to lock up both your back tire and the frame...hard to visualize, just Google it if you're not convinced.  I use a cable lock to secure my front tire to my frame.

UPDATE: 12/18/2013 - Just thought I would note that I still have my lock (and bike!) and everything is working smoothly.  I use it daily.  Also, the little modifications I made as described above have held up and I haven't had to fidget with anything since.
3496443
This is a wonderful lock. Easy installation and easy to send keys.  Works great.  Only 4 stars because was looking forward to rekeying to old locks keys. Can only rekey if key is rounded top kind.  I have a triangular top kind. My old dead bolt company started with an 'S'. No mention of this limitation in extensive research I did so here it is. Would buy again though.
2359288
I really like this lock.  First, I was really impressed that it came in a nice box with padding, very simple instructions and a thank you note with a bonus offer on their site!

The lock itself looks nice and seems very durable.  The buttons are easy to press and the dials easy to turn.  Overall, it was very easy to figure out and set your combination with the instructions.  My favorite part about this lock is that you can use it for just about anything.  With a lot of other locks, you run into the trouble of size compatibility when switching from one suitcase (or anything else) to another.  The strong cable is very flexible and long enough to wrap around thick handles.  It is also thin enough to insert into even the smallest rings and zipper heads.  I definitely recommend.
2664424
I'm happy with these locks, and the price was a lot lower than I almost paid at Home Depot.  They work as advertised, the app is easy to use, and setup/install is pretty simple.  A big thing for me was they integrate with Apple Home Kit.  Also, the guest code feature is nice, you no longer have to give keys out to family, or housesitting friends and can easily change or disable the code
3662967
I haven't had any problem with this lock. I think you must be careful when setting combo or it may not be secure. Setting the combo was a little tricky. Just take time in doing it correctly. "No Problemo" I also like the added feature of the "Kevlar" reinforcement.
3521957
Replacement lock works great, check the number if you are trying to match them.
2454024
Great lock, works perfectly.  Would highly recommend.
3292141
I received this locking pin today along with the hitch receiver it will be used on. It fits, the lock operates smoothly, and the keys work well. I haven't tried to secure anything with it yet, but I don't anticipate any problems. Satisfied.
4302663
I was looking for a lock for my gym locker that was a set-your-own (who wants to bring a key?). This one looked solid, durable, and easy to set. I wasn't disappointed -- it's been easy to use and just what I wanted. Only one small issue: while some set-your-owns can be set by manipulating the hasp, this one requires a small key to be used to set a new combination. This key is guaranteed to get lost, and it's tiny and you only need it once in a long while. I wish this were designed into the lock itself. Otherwise, this has been a perfect purchase, and I'm quite happy with it.
2493048
This lock is exactly what I was looking for.  I needed to lock a particular room of my house due to having a child with special needs, yet needed the others to access it without having to worry about losing or having keys.  This is perfect.  The lock is solid and heavy.  And it's not a small lock by any means, but it definitely does the job.  Initially, I thought it might be too "big and heavy" for the door as the internal door I was installing it on is a hollow core door.  I ended up using some specialized anchor screws for the two screws farthest away from the door edge.  The other two caught the solid edge of the door just fine.  Although I appreciate the security screws included and think they are a nice offer.  I decided NOT to use those as I'd like to be able to remove this lock if need be. So offering the security screws as well as a normal set would be a nice touch.  I have had no issue with setting the combination or with it "unintentionally" getting reset as others have noted (perhaps due to the changes to the bolt as mentioned).  This is a great option for anyone who needs a way to lock a door and not be concerned with keys or independent locking mechanisms.