Word of warning if you look at going down the Spidan springs and Monroe Reflex route... a road that I know very well in Snowdonia became somewhat scary with my new setup, there's a lot more lift over bumps! The dampers did their job but the car felt nervy for the 1st time ever making me question my choice. Indeed I think now, in hindsight, I'd have preferred to stay with stock suspension.
I haven't noticed a major improvement in comfort and to be honest, I never found the sport springs plus 17" too bad but things like the rubber seats should be checked as they do wear out.