i used to on an older computer... not anymore. i know nothing about the ESA, but i dont like them already haha.
honestly, i would recommend getting a nintendo DS. its the best video game system i ever bought. there are so many great GBA and DS games that justifies the purchase. all the original marios (for nes and snes), mario 64, FF 1-6, advance wars, new super mario world, etc. hell... even my gf likes to play some of the games (mainly trauma center... a hospital surgeon sim).
and its a great way to pass the time on the toilet.