Basically these boards are the latest answer to the legality question of selling multi-boards. There are basically two boards that are causing any stir at all. This one and the usually misnamed "Multicade" Board which is an older board that ArcadeShop used to sell (4 in 1, 9 in 1 and 39 in 1) and now have moved to this newer board which is supposed to be lawsuit bulletproof since he sells it without any roms and it is up to you to download them off the net and install them on his board. It comes with a little proggie that burns the roms to the board and turns on the menu selections for that game.
There is no doubt that this board is better than the older 39 in 1's but the prices on those older hard coded boards has fallen drastically comepared to the price on this newer one, for whatever that's worth.
I would say that yes, this is the same board as the Multi Williams (Which is one multi board that no one cares to sue over, only certain pill munching, insect shooting games are under fire) Why produce two boards when you can produce one.
I'm sure that it is using some form of MAME, the installer program limits which games you can install, perhaps a little tweaking and you could do more. Also the board allows you to install 12 or 16 games, then after the price war Gregory announced that with a "software upgrade" you could now put over 45. Obviously someone was holding back a bit...
DF has already forced eBay to pull all "Multicade" machines saying he is the only one legally able to sell any form of multigame machine. I must say, if he is allowed to continue unchecked he will own MAME. It's his M.O. sneak in and try to make money off of some preexisting thing.
I wonder if anyone knows that Ultracade started out as a bootleg system just like these sorts of boards, and as of just last June all the NAMCO games were present on Ultracade system until DF got his own cease and desist.