Had one friend who had the chain cut, right through the link. Not sure what was used on it. Think she had the Fahgeddaboutit too.

Had another friend who was using an American lock on a chain (what was recommended post pic pen) and that was chopped right through, looked like it was done with large bolt cutter, took them a couple tries to cut it. That was at a known hot spot for thieves (outside of NYU's film school) and I've never seen or heard of the actual chains or kryptonites getting chopped so one would hope they are stronger then the American padlocks (which btw are what many NY stores use on their gates)..

Personally I use an old onguard mini plus a ny chain. found the chain can go through both wheels and a pole on track bikes and road bikes with short geometries. Also have a veratomic quick lock on the front..