Arif, I own VXR since 2001 and so far I am quite happy with it. I am running on Petrol (no CNG installed). My ride is not much so fuel cost is not much concern of me.
Bad things which I have faced so far are: a) noises from different parts of car, b) Brakes, c) cabin heats up immediately if you park your car in sun in just few minutes, I never have this problem in my old cars Corolla and Sunny or perhaps it is just a feel, d) Steering vibrated at 100 km/hr but this problem was gone once I changed the stock General Tyres with Dunlop, road grip also improved.
Good things are a) Air con, b) Low maintenance, c) seating capacity and ample leg space that is not available in many cars of the same range, d) comfortable ride.