I just don't see the need to have a chain lock unless you're a messenger. A mini-U lock locked up correctly with little to no room to slip tools inside is going to be nearly impossible to break in a timely manner with regular old tools. If anything a theif will go for an easier target, or try to break the thing you've locked your bike to (if you were stupid and locked it to say, a thin link on a fence, or a short sign post). But yeah, 2 mini-Evo's are going to be less weight than good chain and provide for a hell of a time for anyone that wants to get through them. Hell, 2 mini NYFU's would probably be lighter than a heavy chain too.