I'll weigh in with my experience...
I've had my 2009 997.2 for around two years now. I bought mine from a Porsche Dealer (Gold Coast, Queensland, Australia) after a lengthy search. Mine is a "launch" model for Australia and comes with most options including PDK.
C23 Version for Australia
026 Silver faced stopwatch
250 PDK gearbox
377 Adaptive sports seat, left
378 Adaptive sports seat, right
640 Sport Chrono Plus
762 PAG Code - Launch code
844 Multifunction steering wheel
983 Seat covers, front, leather
It's also got PSE which I had the dealer add at purchase time as part of negotiations. So in terms of reliability I have had no issues other than when I had the FabSpeed intake on, which after about two weeks generated a CEL. I removed it, replaced the stock airbox and had the dealer clear the error codes. It's been for two services 60K km and 70K km, both done at the dealer here in Brisbane, the 60K km was $595 AUD and the 70K km only $395 AUD. This is quite a bit cheaper than my wife's Mercedes (2013 C Class Wagon). The only other expense was the OTT software\map update for AUD $395. I drive the car every day, about 50km round trip to work in mostly city traffic. It carts kids to Scouts and picks up the groceries. So in terms of reliability the Porsche is pretty reliable. Queensland is a very humid area in Summer, with temps around 30+ degrees, Winter is quite mild with temps only getting to single digits once or twice. The biggest issue is the crappy roads and Australian drivers. ;-)