Depending on what yr the SL are the information is correct.
Carbon injected base for SL Previous yr only not 2013 current line.
SL has Base III which has more dampening then BASE II and no plastic at the heel. For current and last year 2012 only. previous yr was Base II.
As Spencer said the base on the FORCE absorbs alot of the shock through the material having it give more which is better for jumps and stuff.
The Union buckles are hard to take off at first but after a couple of runs they loosen up and work real well. The toe buckle needs work though and jams/malfunctions alot. Simply buy some burton getta grip. For$200 retail they are probably the best response all round bindings at that price point.