Alpha - seems the folding locks, while very convenient, don’t fair well in tests. This includes the biggest one from Abus. The cafe lock and cable is a good item for quick I and outs, but be it beyond that. Depending on who you talk to, what you watch, and what you read, each group seems to have a preference for the “best“ u lock. Bottom line, it always seems to come down to Abus and Kryptonite with Abus being the 540 XL and Kryptonite being the LS 18 lock, or Fegaddabotit series. Both are good, both can be cut with an angle grinder. My only squawk about the Abus 540 is the overall length , but I’d rather the lock be too long than too short.