I recently bought a subwoofer box from Boomsday, and I can't say anything except that he was great. I had lots of problems and questions(being a noob to all this audio stuff) and he was able to answer every single one without trying to sell me something. Originally he responded to a post from me saying I needed help with something. After a few hours of talking to him, I decided I'd rather him build my box and get everything right than for me to try to do it.
Box is 5.8cu^ft tuned to 32Hz and it's holding a Fi BL18. Everything sounds great.
Screwholes are visible in pic because due to my retardation, I forgot to measure for the trunk latch and tried to take of front baffle to get box in. I later figured out how to move the latch temporarily, so I put everything back together(I couldn't get the baffle off anyway, it was wood glued)
He is not at fault for that, and even told me the exact paint he used so I can fix that too. I'll be a return customer if ever I need something else.