Per a post and link on crawdaddio's thread on locks as I recall the street cuffs are easily broken. The weak area is the connection between the two cuffs. Most of the Master Lock bike locks seem to be pretty poor for the prices.

Here is the link to the crawdaddio lock discussion, all 310 posts so far

http://www.bikeforums.net/showthread.php?t=520597

A larger version of the fahgettaboudit U lock is the New York Lock M-18WL. It is shown in the Powersports section of the Kryptonite web site. BTW I weighed one and it is 6 pounds. Even the fahgettaboudit is over 4 pounds.