I fitted some of these to the SVS (2 hours, no need for anything more than spanners and hex keys and not much you can do wrong if you put it all back the same way it came off the old bars) to get over my backache on longer trips.
Now the bars are higher, wider, further back... feels more like riding a rodeo bull, plus a more upright position. So the comfort thing works and is worth the £217 delivered cost.
But how come nobody's mentioned how much they help the steering?! I've been going round bends and roundabouts like a loon. The standard clip ons are pretty poor at letting you change your line mid-corner, but with these there's much more leverage/control and it's a real giggle pushing on the bars and cranking the bike over.
Exhaust pipes, plastic/anodised bits/even the R6 throttle tube conversion are all nice, and add a bit to the bike, but helibars are much better - more comfort, better view of the road and faster round the bends with it
Reminded me a lot of the Fazer 1000 I test-rode. Now the SV is almost as much fun in the bends, even if the power and smoothness isn't as great as on the Fazer.