price per service varies dependant on the mileage oil and filter versus full cambelt change - there have been some issues with the STI sharkeye experiencing ringland failure due to constant high revs and potentially not using higher ron fuel - a remap, not done by a subaru dealer as allegedly their maps don't solve the issue either, will protect against that (£300 - £400) also going through top mounts (not a huge expense)
so from my experience there were no issues and I really enjoyed the motor.
dont buy this car with one eye on your wallet - the mpg is between 21 mpg normal driving around town and 35 on a run. services are between 150 to 500 approx as different places will vary
do buy this car for a full on driving experience you will annoy porsche drivers - it put a smile on my face every time I was behind the wheel
Pete will hopefully be along shortly with an opinion also :)