I never got the appeal of these tiny things. Maybe as a desktop novelty, but it's cant be fun to play on them. The GBA SP in its original form would be much more ergonomic.
Amazing what you find in the Main forum these days.
You know before I built these I thought as you do, that it would be hard to play these, especially seeing as Im 6' 6" in the old money with large hands. However, I was very pleasantly surprised when I played them that they are in fact very easy to play. In comparison to the GBA SP, they are way more easy to play, especially if you play games that require diagonal movement . Thats not just my opinion but also that from the feedback I have received from those I have built one for.
I have also helped a loooot of people build there own, (one day I'll post a gallery of there work if they want me to). And they are also very happy with what they have created. Some have used some pretty inventive things to create there own including other HW instead of a GBA and wireless inbuilt controls.
I wasnt going to say anything about this , but I know there are people on BYOAC who are contemplating building there own and probably have the same thoughts going through there minds. So basically Im saying if your contemplating building one of these and are worried about its playability, dont worry , as long as you dont make a hash out of the control and button arrangement it will be very easy to play.