I bought this lock to use for quick trips to the coffee shop or to run errands. I love that it is so light and easy to carry in my bike bag. I wouldn't trust this as a replacement for my U-Lock for bike commuting when I'm parking my bike for longer hours, but it works great for trips where I'll be in and out of a store.
Familiarity: I've used it once or twice and have initial impressions
I like the idea of this lock over a cable lock in that it seems much more secure, and is actually pretty nice that it folds up pretty small. The only kicker to me was trying to maneuver the lock to actually be able to use it. To get the end into the locking mechanism you need to come at it from one particular side, which over time would probably become an instinct, but can really be a pain with trying to carefully route the lock (example in photo).