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I got my frame done at Argos, it looked incredible for about 5 minutes. Literally anything chips the paint off though.
To their credit, they did offer to re do it, but I never took them up on it. End of the day no point having something pristine that gets used, and there is a really solid primer underneath.
In summary, I wouldn't pay to use them again unless it was a frame I'm hanging on a wall.
Purely anecdotally, based on forum posts over the years: if money no object, Argos, otherwise Bob Jackson. All painters seem to produce duff jobs once in a while, but those two seem mostly reliable. If you're going for plain colours, get ones that can be matched with Humbrol enamels or similar for touch-ups; metallics are trickier, but can sometimes be matched with car paints or nail polish. Flams are the prettiest, but any chips and scrapes are there to stay.