I've emailed back and forth with Mark, I'll be straight up and say he seems downright rude, seems to have no idea about customer service and doesn't really pay that much attention to the rabble he's putting on the website either. Saw a EBMM Bongo on there labelled as a Stealth 5 when it was a gloss finish 4 string.
I can also honestly say, he's way overpriced and seems to think high end basses like Fodera, Alembic and Sadowsky for example are worth squat.
My take on things is, I want someone who is polite, someone who knows what they are talking about and are friendly to deal with when buying gear and bits.
I could not recommend the guys over at Bassgear more.