I think Tomeygun, the maker of the adapter, said it would fit the G56 equipped trucks--However, contact him through his page to be sure.
The advantages?
1) Looks much cooler than stock!
2) Has HURST on it.
3) Moves the stick slightly closer to the driver.
4) Shift pattern matches the NV5600 and the shift knob is bigger.
Unfortunately, it is not a "short throw" shifter, but there are kits to install a short throw shifter--I think Geno's Garage has them?
Anyways, it's basically a coolness factor--but not overdone.