I've used Chipsaway twice; the first time was the Wigan franchise who said that the damage to my bumper was about the limit of what they would repair (the bumper was crushed in a small area and the surrounding paint had flaked off). I went ahead with the repair anyway and it still looked perfect when I sold the car 18 months later.
The second time, they sent the Southport franchise out who collected the car and took it to their workshop. Again, it was an absolutely perfect repair which is still invisible 18 months later. For reference, the damage this time was a small dent in the bottom section of the bumper and 4 very deep scratches.
I know people have preconceptions about these mobile repair guys and to be fair, I did too; both times I called them out really just expecting them to make it look a little better but happily, I'm completely satisfied.
Adam