Just saying hey
Join Date: Mar 2007
Location: Atlanta, GA, USA
If it'll help, I'll offer my two cents. I switched from an '05 R12RT to an '06 GT in Jan. this year after putting 27K on the RT in the 18 months I had it. The RT has a little bit more upright sitting position and offers a little bit more protection from the elements. The windscreen and fairing are a little wider. The R12RT handles a lot better than the older RTs, feels lighter (because it is), more flickable, has more power and such niceties as ESA. I don't think the older RTs were any more 'flickable' than the new GT. The old GT doesn't compare. I had an '04 R1150RT for a short time and then an '04 GT for a year and found it to be beast compared to the new one, IMHO.
The GT2 is about the same weight as your RT but has at least 60 more horsepower. That difference is phenomenal and will be the most readily apparent. It'll take some getting used to because the GT's engine is so responsive you're going to have a bit of a learning curve becoming accustomed to bike wanting to leap forward. I've taken the GT through the tight twisties of the north Georgia mountains a few times and the biggest difference I've noticed is that it is so easy to get up to much higher speeds on the GT than it was on the RT before you're into the next curve.
The RT I came off had the same extras the GT does such as ESA, cruise, and the best power assist ABS BMW has come up with. The '07 GT, I believe, doesn't have the power assist which some like and some don't. I find it outstanding because it allows me to always ride with only one finger on the front brake and with that one finger get as much or as little braking as I desire while simultaneously working the throttle.
FWIW, I've had I guess six BMWs in the last five years for various lengths of time and this new GT is by far the best of them for the street for my money. Acceleration and handling sufficient to satisfy the adrenaline addiction plus the comfort for numerous long days in the saddle. I have only one warning. It's going to take some discipline to keep from attracting the attention of the LEOs because the GT does like to fly!
'06 GT - CGM = crystal guided missile