Groovy Game Gear has crappy communication and is slow. (Mod edit: Disputed, read

[yotsuya]

Regarding the Pi: I do agree with some of what has been said above.
A good PSU is absolutely mandatory or you will have all sorts of 'weird' issues.
Having written code that runs on ARM/Pi I can confirm that the LEDWiz works as it should ( and his little brother too - I always forget the name - it has the same hwid)
What is a problem is that most Pi users use linux because they have to and not because they like it and that is the major stumbling block once it gets a little bit complicated...
I tend to disregard people too if I feel they didn't do their homework. All the other ones I've helped...
Most do their homework though.

Well said.