Billy I got a GB270 a couple of weeks ago and I'm very pleased with it.
Goes in for its 1000mile service on friday, so will be able to tell you more after that.
Compared to my bugeye WRX it has loads more low end torque.
Having never owned an Sti can't say how it compares to yours.
I too got offered more than I was expecting for my bugeye, that made my mind up.
Also got a letter in from S&S this morning, they are having a couple of open days 1st & 2nd December, it states
on the letter that there will be special deals on the GB270, don't know what, don't want to ask incase it pi55es me
off having just bought one.
It also states to call to confirm attendance. 01292 880080