What it does do, is affect the way in which you control the bike. It all depends on how how tall you are, how you're built and your riding position. If your position is already perfect, then it will possibly be detrimental. I fitted 1" risers, and they make the bike more "flickable", and give me a more relaxed and comfortable riding position. I'm 6'1".
split 28
As another short-@rse I'll echo Telfords comments on NNs offering; more comfortable riding position after fitting & esp. so when stood up on pegs.
I fitted the 25mm Wunderlich ones to mine, huge differance to the riding position, made it so much better and relaxed.
That said, it did some miles to get used to it as it felt a bit like riding a chopper at first!
No differance noticed with the handling at all, so don't worry about that.
Just a thought though, and I think that I am right in saying (?) if yours does not have ABS then you might need to replace the front brake hose for a longer one?
If you have ABS, then its just a case of cutting the first couple of zip ties on either side of the headstock to allow the cables to flex more due to the added height of the handlebars.
You don't need longer lines if you have a non abs bike with 25mm risers,they didn't change it much for me anyway so I took those off and slashed out on a set of Ricky bars.It's the best £213 I have spent,it's a real bummer Ricky has stopped production as they really do improve the handling/feel off the bike.Andy