I bought this lock to secure my bike both while it's on my Thule hitch rack, and to secure it when I'm on bike rides where I am getting off the bike to explore or eat. I haven't yet installed the bracket to my bicycle, and even after I do, I will only be using it when I'm pretty sure I will need it. The lock isn't big enough to secure the bike to my car rack unfortunately. I believe this lock will ultimately do what I bought it for, but I am a little disappointed that it won't fit on my car rack.
This was a little expensive, but as long as my bike doesn't get stolen it'll be worth it. It's pretty heavy, but I'm able to leave it attached to the bike cages where I work. I wouldn't want to haul it around everywhere I go. I was concerned that it would be too short, but the lock and cable are the perfect length to secure my frame to the stand, then run the cable through both wheels. My one significant complaint One of the keys includes a small flashlight, but it didn't work. It wasn't worth the hassle of trying to replace it, though, so I just don't use it.
I really don't think there's a better option for the average bike commuter with average bike geometry. The shape of this lock works on all three of my bikes, the 20 year-old commuter, the new carbon cyclocross and the all-mountain suspension bike. Any robust lock will come with some heft, but this one is noticeably lighter than the Fahgettaboudit Mini while still providing a nearly comparable amount of security.
So far my bike has not been stolen while using this lock. It is the exact size I needed and all of the moving parts operate with the feel of quality and good design. Materials are sturdy and features are great!