The tests by Soldsecure and CyclingPlus indicate they are equally strong against the sorts of tools crooks typically use.
I prefer the NY 3000, because it weighs "only" four pounds. The strongest chains, plus padlocks weigh considererably more.
I've noticed that a lot of messengers in Houston prefer chains. Messengers have to be fast to make any money, and don't have time to go hunting for a steel pole that is the correct size for a "U" lock. The chain locks enable them to lock up to light poles, telephone poles, trees...lots of locations that a "U" lock would not fit.
I don't mind looking around for suitable locking locations, so the "U" lock works fine for me. My everyday locks are mini U-locks from OnGuard and Kryptonite. Although they are mediocre on the "test" bench, mini locks work well on the street. They simply don't provide enough empty room to insert effective leverage and breaking tools, and (knock on wood) the use of power cutting tools is not a problem in my neighborhood.
The best locks are those with a "gold" rating at soldsecure.com. The "Magnum" chains and U-locks with "gold" ratings are sold in the USA under the OnGuard name. The best OnGuard locks are a bit heavier than the best Kryptonite locks, and generally did less well than Kryptonite locks in Cycling Plus tests using power cutting tools, but equally well against leverage type attacks.
Last edited by alanbikehouston; 09-15-05 at 03:15 PM.