I've had one for about 15k miles now and I love it. Combined with a GReddy counterweight shift knob and urethane bushings and the shifts feel so much sharper. The transmission does exactly what you tell it to, when you tell it to--there's no slop anymore. But since there's no rubber damper on the shifter stick, there is a little bit more noise. Worth the tradeoff if you ask me...
The boot is pushed down farther, but not so far down that it looks bad IMO. It definitely doesn't affect performance in any way, so it was a non-issue for me.
I'm sure the STS/TWM short shifters are nice, but the price point of the Fidanza was too good for me to pass up.