I got the Onguard locks after learning about the Kryptonite trick last year. I was using an older Kryptonite ATB Ulock and saw that I was riding around on the most expensive on the racks at work. I just bought a KHS witchdoctor and wanted to commute with that in case I wanted to do some urban assault after work. I picked up the longer Beast chain/lock witch I keep at work. I nearly passed out bringing that thing to work--it weighs close to 17 lbs! I found a deal at the LBS for an older Mastiff model that used the tubular key, but was informed that it was different than the one that Kryptonite uses (meaning it was bic proof). I use this chain/lock combo and ride around with it all the time. sometimes I'll use the lock and a thicker Onguard cable when I'm out on short trips. With their flat keys, you need to make sure you get them in all the way, or the lock won't turn. Some people have broken off keys in their locks, but I feel this may be due to impatience and muscles.