Yes I have one and love it. Yes some people have concerns about build quality but mine is still good but i am a fair weather rider.
I've got one fitted, love it. Sounds menacing but not too loud. Not long been back from a trip to Spain and do a fair mileage, so far no issues. Performance drop doesn't bother me, in my opinion it has bags of power far more than anyone needs on the roads.
I have a Taylormade exhaust in the 'for sale' section: http://1000rr.co.uk/threads/taylormade-exhaust-2008-11.30498/
I would be strung up by the Mrs if I bought that mate, after buying the Sp, new leathers and changing the tyres on a brand new bike, I'm finished for a few months anyway
Got one fitted on mine. Had it dyno'd and corrected the fueling and it made 168bhp at the rear wheel. Given it made 171bhp from the factory (at the crank?), allowing for a 5% loss to the wheel she's gained 5bhp with the Taylormade. If the factory figure is from the wheel then she's only lost 3bhp, hardly noticeable for how well it looks