I am a little leery about that built-it lock. But the New York Chain links are thicker than the Evolution chain as well (14mm vs 10mm). My main concern is to be sure I'm getting above the threshold where the chain can be cut with 2-foot bolt clippers (with ground leverage) or 3-foot bolt clippers (without ground leverage).
Unfortunately the security ratings system is pretty much useless, because all that's tested is how many seconds it takes to cut through a locking system using power tools. E.g. one U-lock is rated "10" because it takes 3 minutes to cut through it with an angle grinder and another rated "8" because it takes 1.5 minutes to cut through it with an angle grinder. You don't get any info on what kinds of attacks it can totally withstand, maybe withstand, definitely not withstand.
Last edited by torquewrenchles; 01-24-13 at 08:55 AM.