Twain: yep. More to the point it's much less active when you are standing up, because the BB is on the swingarm. Suspension works better the less weight is on the UNsprung part of the system. ( ie the stuff outboard of the shock ) because it's less mass to move and therefore takes less energy to move, meaning the bike goes faster and the suspension moves more.
When you stand up on an URT your weight gets added to the weight of the swingarm, wheel, tyre etc, so it massively reduces the effectiveness of the suspension. This was seen as a good thing by people who didn't want a bouncy bike when standing up, and you can see the appeal as it meant less adjustment of riding style. Hence I can see the appeal of such a bike, I am just saying that if that is what GT were trying to do with the iDrive - make a bike that didn't feel too suspesiony then why not just do an URT anyway? or redesign the RST which had a similar feel? But then I suppose it's just technology moving forward and the iDrive is a development of that. I guess it's just not my bag ( being a fan of single pivots or Horst Link designs )