Customer Rating:  
Summary: Nice lock, frustrating warranty
Comment: I like the lock just fine -- easy to use, seems like it will hold up. But the paperwork was a pain. First, you couldn't fill it out on-line, you had to print it out and fax or send it in. Second, the "theft" insurance was so minimal (won't cover use of power tools to break the lock, doesn't cover damage to bike while theft underway, etc.) and such a hassle (have your bike appraised within 15 days of buying the lock) that I just decided it wasn't worth it.
Customer Rating:
Summary: Best lock you can buy!
Comment: I live in a city where there is an unbelievable amount of bike theft. When I got my new bike, I knew I had to go to extra lengths to protect it. After doing a lot of research, this lock stood out as the most effective at preventing theft. It is nice to know I don't have to worry about my bike. Thieves just pass on by, looking for easier pickings.
Customer Rating:
Summary: Good lock. inexpensive.
Comment: This lock is very strong. IMHO, no one is going to steal your bike with this thing on it unless you have a $2000 bike that they really want. It's also relatively inexpensive and light for the job it performs.
Customer Rating:
Summary: Lock okay, mount less so
Comment: The lock itself seems sturdy enough. At least one review found it resistant to most attacks. ([...]) It is long enough to capture both the front wheel and the frame, along with a fencepost, which is a good thing if you have a quick-release front wheel (which can be removed in 2 seconds without tools.)
However, the lock is too big to mount inside the frame of my 53 cm road bike. (The mount requires a little clearance above the lock to allow the lock to be slid up out of its mount.) That is not a small bike, and there are many bikes with smaller frames.
Luckily, the lock and mounting system is flexible, accommodating nearly any tube size. The piece that takes the lock can be removed by unscrewing four screws, and rotated 90 degrees. Also, the mounting piece on the lock itself can be rotated by loosening a set screw. Those two things mean the lock can be mounted several different places on the frame. The instructions give several suggestions, with a list of pros and cons of each. One problem with a few locations is that the lock can interfere with your pedal stroke.
The mount itself is not all that easy to attach to the bike. You have to place an thin, H-shaped piece of rubber (included) between the mount and the frame to keep it from sliding around. The rubber isn't attached or glued to the mount for some reason (possibly because it is a last-minute addition) so it is easy to lose. It also doesn't fit the mount exactly. I dropped it few times before I got the mount on securely.
These new mounts use a strap of nylon that you wrap around a frame tube and pull tight, then tighten further by turning a ratcheted bolt that takes up the slack. (That operation requires a metric hex wrench, which you are likely to have because lots of other things on the bike require metric hex wrenches.) You can get pretty good tension on that strap. However, depending on where you put the mount, something (like the rear reflector) can block access to the tightening bolt.
Unluckily, I chose a location that did interfere with my pedaling (it is impossible to be sure whether or not a position will interfere with pedaling without actually mounting it in that position.)
And this is the major flaw with the mount. You cannot reposition it without cutting the strap or probably damaging the mount. The ratchet, being a ratchet, turns only one way. So you can only tighten the strap, you can't loosen it. You can try to turn the ratchet the wrong way, but that usually breaks the ratchet, and this one doesn't seem all that robust. So I am waiting for tech support from OnGuard for advice. If need be, I will just cut the strap and get a new mount from REI (unlike Amazon, REI offers a lifetime guarantee on everything it sells.)
Customer Rating:
Summary: Locking Mechanism Broke
Comment: While the lock itself does what it is meant to do (keep my bike from being stolen), the locking mechanism has broken. I dropped the lock once and 1) the plastic casing around the locking mechanism cracked, 2) there is a visible gab between the metal locking section in the center of the lock (the part that is metal and not covered with plastic) and the body it is connected to, and 3) I really have to finagle the key to make it lock/unlock. Not exactly the best construction...
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