I've used Quy to do my BBS CH's in a custom gunmetal powdercoat finish. I can't say anything bad at all.
His prices are also really good compared to others, especially considering his finish and quality of work.
1992 325i / Briliant rot - SOLD @ 301,000km
1998 318is / Arktic silber - SOLD @ 207,000km
2007 335i / Jet Black - CURRENT @ 28,000 km