Recently purchased the C30 with 6 speed manual to use as a daily driver. It has a very nice balance between handling and comfort with a bent toward the fun side. The acceleration is decent and the car is nice and solid. For such a small car, I feel safe (I guess typical Volvo) -- the doors are sturdy and the car is heavy for its class. The car is unique in appearance and is general a joy to drive (have put 2,000 miles on the car - so beyond the "honeymoon" period. Demerits include slight rattle from both windows when partially down and horrible whistling wind noise from the seatbelt outlets when fully open. Decent but not great Dynaudio sound; manual not up to par with other European cars.
ride quality balance, good looks (both interior and exterior), fun to drive, reasonable interior room for small car, safety, and nice engine/exhaust sound.
address wind noise and rattle with windows down; R design looks nice but front spoiler a magnet for stones; more accurate shifter; Dynaudio OK but probably not worth money.