I agree with you. The kryptonite NY lock is probably the best U lock out there. However, it's heavy, even heavier than other U-locks. Other U locks (Kryptonite Evolution, Abus) are also very secure, and a bit lighter. If someone has tools which can defeat an Evolution, they'll also be able to defeat the NY lock, it'll just take a little longer. (I use the Evolution mini.)

I don't mind spending a bit more for a good lock; to me, the extra $20 is worth the extra piece of mind.