I have one and I must say it's pretty nice for the price. Mine has the expansion cartridge slot, but I haven't tried it. It claims to have like 16,000 games on it, but there are really 80 or so (all NES games) and then they just repeat (clones of some sort). The most pleasant surprise is the lightgun which works very well on Hogan's Alley and Duck Hunt. Of all the mini consoles I've bought, it's the only one that hasn't ended up in the garbage. Has anyone actually tried the expansion slot?