ive had my x1 for about 4 years now, and apart from the antics i had for the first 2 days, i have not had a problem since.

the only thing i will say, is that sometimes when playing different midi files, various tracks "lock" into VOCAL01 for some reason, most of the time its track 16 but sometimes tracks 5 does it. To get out of this, i genrally have to reset the kb, as just simply selecting another midifile does not cure it. Strange....