For those who own an SD2SNES, there has been some wonderful developments with special chip support being added to it. SuperFX is now fully functional, and SA-1 is in beta (Super Mario RPG, Kirby Super Star, Kirby's Dream Land 3, Jikkyou Oshaberi Parodius, etc.).
With these additions, the SD2SNES is the definitive flashcart to own for the SNES.