Does anyone have experience with this? Harmonious Audio MPA-1a

http://www.ebay.com/itm/Harmonious-...r-/331321347484?ssPageName=ADME:X:RTQ:US:1123

It's got some good reviews on Ebay, but not much else out there. Anyone have, did have, know a guy who had one?

Was thinking for $100 it's worth a shot, but also thinking "Only $100" too good to be true?