To be fair, city powdercoaters have been used by a fair few people on various forums, and while they seem to have made the odd bit of bad work, they're still fairly popular. But obviously they're your wheels so don't take them anywhere you wouldn't trust.
I will be giving them a go at some point, but mine do need some remedial work rather than just stripped and coated so I'm not expecting to fall under the £80 offer.