To be fair, most of the alternatives are garbage, but also most of Kryptonite’s own products are garbage. There are ~3 worthwhile bike locks on the market. 2 of them are made by Kryptonite. The rest provide the same value as the TSA. Mostly theatrical.

On youtube there are videos from an expert lockpicker, I can't remember the name, where he goes on lockpicking kryptonite locks. He explains in great detail what he expected more from the high end, but his recommendation by the end was still a kryptonite lock, not necessary the ultimate, and said that unless you are ready to lose the bike, unless it's in sight, there is very little you can do. And with an angle grinder you are doomed either way

Previous discussion on this: https://news.ycombinator.com/item?id=22141719