We have the Sport with the same engine. Its needed a few suspension height sensors, brake pads and rotors at least once a year all round (unbelievable how quick it eats them!), intercooler hoses and parking sensors. All this is in the past 3 years which, considering I did it all myself isn't too bad at all.
On the whole its been very reliable despite its mega mileage and still drives really well. Fabulous vehicles, they really are. If you have a height sensor fault it can be a real PITA. Ours went coming back from Manchester Airport one year. We had to drive the remaining 100 miles on the bump-stops all the way as the suspension just lets all the air out if it can't figure out what height its supposed to be at. That was fun.
The FFRR of that generation (the L322) just has too much body roll and is noticeably slower with the same engine which is why we settled on the sport.
I've had an offer accepted on a pre-facelift 955 turbo this morning with low miles. Its to get me over the winter whilst I decide whether to keep the RRS or not.. I hopefully pick it up after the weekend. Can't wait! An awful lot of car for the money especially when you consider its still more powerful than an 992 Carerra!