if by buggy you mean that the MK3 cannot be flashed to,then yeah.its(the mk3)useless except as a passme(?)
However,using it(0.6a2)to run directly from sd and to flash(multiple roms)to the neo-cart,i cannot get it to screw up.my son and i are using completely independent set ups,him with1g sandisk,me with 1g kingston(its in my head that using multiple sd cards may cause this to go"poof"-i use a 128mb sandisk for moonshell,but i try to just use the one sd card)and for a week now,we have had no problems.
Surely,this kind of feedback is why the menu version was included with the mk3 2006.NEO had to realize that some people would be experimenting with it.im not recommending it(as i said,you cannot flash to mk3-Bruceg said something about patching routines-latin to me)just explaining my experiences with it.with the amount of NEO-stuff ive got now,i have a lot of options to mix things around,and im just trying to optimize it all.