Atm, number of working games will increase with time, once psx4all will be more optimized for the n900's hardware and OS.

However, in the end it depends on the original authors of psx4all, wether they did a good job or not. You can try out psx4all for another OS, and see if it runs the games your having problems with on the n900. Then youll know its future, more precisly.

Atm. I'm playing Tony Hawks pro skater 1 on full speed. (tested and tweaked settings for hours to gain this) I also have tony hawks 2 and 3, and they work at maybe 80% speed with same settings. And are all very playable.. also FF7, driver, kula world, GT1, Tekken 1 and oddworld.. Those are all the games i got to work (More or less playable). Everything else crashes/gets stuck, or have glitches in the graphics... and i tested maybe 20-25 games so far.

PS: Alot of the games i test, i try both US(NTSC) and EU(PAL) versions. And try diffrent bios files. That never really helped anything.