I've had my 1150GS for a couple of months after a Fireblade. Fanstastic bike but you quickly find the screen turbulence to be a pain. After reading this site I bought the Tobinators and whilst pricey for a few pieces of aluminium and screws they're a lot cheaper than a new screen and they do work! I still suffer from wind noise above 80, but they're well worth fitting.
Haven't gone down the Remus route - as don't want the noise, but the y-piece apparently adds on mid-range, though I'm not yeat clear if it gives fuelling problems.