My dad owns a workshop so i do most the mechanic work myself however we don't tune performance cars so my car is in for a tune at ASG monday, was supost to be a few weeks ago but had problems with the computer. So far my experence with ASG is great they are very helpful (they sent my computer of to be checked out the same day) and like Joe said they do take care of your car. I have also been to Tenagah for a few parts and they have great customer service. Hyperdrive did a great job of tuning my skyline also. Like a lot of ppl have said best way to decided is to go speak to them in person