I don't post that often(at all really) but figure I'd chip in on this thread. I'll try and cover just about everything I can think of that might be helpful.
I've had a 2008(older style seats) 2.2 SV for about 9 months, all told I've put 10k miles on it in that time (clock is now reading 32k).
The computer is reading an average of 29.1 mpg, that's based mainly on my commute which is a mix of lanes, motorway and crawling traffic each day, this is around ~20 miles each way.
As far as the seats are concerned, I've never had a problem with the seats, in a perfect world they'd offer more lateral support for when you chuck it around a bit but they are perfectly comfortable for every day use. That won't necessarily be of any use if you're looking at an S but figured it was worth a mention.
The 2.2 makes a 'ok' sound with the standard exhaust, you get a nice parp at around 2500rpm and again at 4000 , but overall I find it a bit lack lustre I'm looking into a custom system to try and get the thing sounding as good as it looks.
On the looks department I think the 17" wheels on the SV look a little too small for the car and the size of the tyre you have to put on them to fill the arch numbs the ride and feel. Along with the exhaust, some bigger wheels and stiffer springs (like those on the S) would be the only thing I'd change on the car.
Over the 10k miles I have done the car hasn't skipped a beat, this has included several 3+ hour motorway journeys. The ONLY thing I've found is the passenger side window can jam when trying to wind it up some times, but that is a pretty minor complaint. I had 4 new tyres fitted when I bought the car and have just replaced the fronts after 10k as they were bald on the inside edge.
Other than the above I have put a Pioneer app radio 2 in, was a but of nightmare to fit due to having to take apart the entire centre section of the dash but nothing that can't be done by someone with half a brain.