I have the MAS and works wonderfully well.
Others complain about the composite connections, but as I use S-Video, I don't know about that.
I did have to jumper one of the resistors on my 4-Slot to get it to display properly, as the RGB signal from the Neo wasn't good enough for my TV. Supposedly on RGB monitors you can make adjustments for weak signals or something.
The MAS Tech Support guy explained it all to me, and he offered to do the job for free, so long as I paid s/h to and from.
Call them for prices. I don't think they actually take orders over email any more, if the even ever did.
It's a ma and pa sort of setup, so be prepared for some weirdness. When I called to order mine, there was a baby crying in the back ground. When I laughed at this the woman said "it's nice to work from home and save $$$ on child care." Didn't bother me, but it bothers some people.