I've still got mine and nineteen cartridges (plus the Master Gear Convertor to play SMS games on it). It's a pretty good system, but, man-oh-man, does that thing suck batteries, definitely get the AC adaptor!
Samurai Shodown and Fatal Fury Special were the only SNK ports, if I'm remembering right, and they're both so-so [FFS only has 9 of the 16 characters (Terry, Andy, Joe, Mai, Billy, Tung Fu Rue, Duck King, Geese, and Ryo), which is a pretty deep cut, and SS is missing Earthquake, Tam Tam, and Wan Fu]. Maybe they should have went the SD "Nettou" route like Takara did with them on Gameboy.