Go to: http://www.kryptonitelock.com/Produc...1001&scid=1002
Click on the "more info" buttons.

Comparing the "New York Chain" and the "New York Fahgettaboudit", the differences are:

New York Chain:
10mm four-sided chain links made of triple heat-treated boron manganese steel for maximum strength
Includes Evolution series 4 Disc Lock with 14mm MAX-Performance steel shackle
Double deadbolt locking mechanism for extensive holding power
New, higher security disc-style cylinder with more than 1 million key variations
Reinforced anti-drill/pull cylinder protection system

New York Fahgettaboudit:
11mm six-sided, chain links made of triple heated boron manganese steel for ultimate strength
Includes maximum security New York Disc Lock with 14mm MAX-Performance steel shackle:
High security disc-style cylinder
Hardened steel sleeve over crossbar for double security
Double deadbolt locking for extensive holding power

I haven't used either one, but have seen them at the store, and was thinking the chain was different. They are heavy.