I found this retro handheld gaming thing for just £37, specifically I was just wanting one that supported game gear and mega drive games, and this one goes all the way up to 32 bit pre N64 / PS1, meanwhile the one that also supports PS1 games was a crazy £120. I cant tell for sure of I can run my own downloaded roms on it though as although it comes with 3000 already installed, its missing a lot of game gear titles thst I want to add like gg shinobi 2 and lucky dime caper - these two games alone had me needing a game gear replacement for a long time as they and many other such titles have never been re released such as on the 3DS virtual shop. I did send the company an email to ask, it has an SD card slot so Id suppose I can put my extra roms on and load them off a memory card. It comes with 16 Gb internal storage loaded with 3000 games and supports up to a 32 Gb card which is more than plenty for the consoles it emulates, and I already have a few 8 Gb cards I had bought ages ago from a discount bin in a tech store for £2 each and will just pop in one of those with extra roms. Also its only £35 on Amazon, but for just £2.25 more I can get support from the specialist place I ordered it from.