I'm sorry, I usually try to stay out of the nightmare that is the ongoing Revo/Audi-Sport saga, but I feel compelled to comment!
What about the Revo dealer who couldn't even tell whether the car had gone back to 210 code, or 225 code, and wasn't too sure what code he had put on it !?
Or the car that consistently uses 30 miles per tank more petrol than before the trial.....
And there's more.
At the end of the day, you makes your choice and you lives with it.
If you are thinking of chipping your car, talk to all the tuners before making a decision - factors such as geographic location, support facilities, pre and post-sales service, reputation and financial status will all have a bearing. Also talk to people that have had their cars tuned, and try to have a drive of them.
Ultimately it's your choice, and it's a big decision to trust your car (let's not forget, it's £15-£25,000 worth of hard cash we are talking about) to anybody - choose carefully.
And remember that most companies will want to promote their own products so it's up to you to read between the lines, and filter out the facts from those pro, and opposed, to particular products.