No problems with my '08. It all boils down to personal taste. I prefer the Gen 2 to the Gen 1. Yes there is a hp difference, but really, unless you are racing it you won't know the difference, and there is TONS of aftermarket for both Generations to bridge the gap.
There is the voltage regulator recall on the '08-up but that is also for darn near every suzuki sportbike on the market newer than '08 right now, so don't let that sway you.
It boils down to the new tail, or the old tail, since the front end isn't that much different. Plus I like the gauges on the Gen2 over the Gen1. Gear indicator is nice and so is shift light..
Good luck either way!!