I had a Triton Pro with SCSI and MOSS expansion board.  It's got great sounds, two arpeggiators, a great keyboard feel, and stunning good looks.  However, as I've said before, Korg's Triton is a screen surfer.  
That is, whenever you want to change something you've got to surf from screen to screen to screen to screen to screen - no exaggeration!  It's not unusual to have to surf down 5 or 6 screens to find what you want.  That's OK in the studio but if you plan to use it live -- forget it.
I got rid of mine and got a Yamaha 9000PRO instead, and am I ever glad I did.  Haven't had a single problem, glitch, or technical difficulty.  The 9000PRO has plenty of buttons (Triton doesn't), great sounds, good arranger styles, and changing settings is quick and easy.  
If you're looking for a studio controller, then go for the Triton.  If you're looking for a great all-around keyboard, then take a good look at the 9000PRO.  
PS.  The Triton uses Yamaha's 9000PRO keybed and keys, so you get the same great key response.
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