if you want to play gba games and homebrew on hardware then get one. its an odd question really, either you like gba stuff or you don't. i'm not sure why you are asking the community? are you looking for something better? the only slot-2 still made is the ez flash iv. the benefits of the 3in1 is that you can flash it directly from your slot-1. you can either use the native akaio flashing software or use gba exploader. there is no setup for akaio. just drop on .gba files and flash them over. read the akaio wiki for information on the different options which are available.
-another world