The only downside of using a Triton as a controller and your main workstation is it's front end user interface and Operating system. The two are not congruent. It's as if they were designed by different teams and than put together at the last minute.
IN overall the mixture of the two results in some very confusing crap, that can slow down the creative process. For example, the FX setup in the sequencer mode needs to be setup from scratch every time you will want to create a new multitimbral arrangment (song). You will of coarse be able to store that setup when you save the song. BUt the process of figuring out all the routing, buses and algorythm matrixes will kind of take time to get around.

Roland and Yamaha allow you to setup the FX in the Multi (or sequencer) modes inn such a way that the FX used with certain patches will be called up automatically.

Again, this is a really small example. It doesn't affect Triton's performance as a controller.
Its keys do though. As it was pointed out by one of the guys, it has a really crappy keyboard feel. Very light and plasticy. Bad for pianos, bad for orchestral stuff ; good for organ and synth leads though.
I wasn't that impressed with its external controls either. Definite cut back on the quality of hardware. ALthough

I've owned a ton of Korg workstations and just at around 1997 or so I noticed that they were beginning to use cheaper hardware components. First I kind of didn't pay much attention ; having checked out the first Triton when it came out confirmed my suspicions. Comparing to the Trinity and even older O1/W it was a heavy, bizarre beast with odd problems. Mind you the
Trinity was no feather either but at least it felt like it was worth a few grand when I played it. Z-1 was another bastard child. Heavy, sluggish and full of bizarre and confusing limitations. Sounded great though.

Again, just because the Z1 and the first Triton were that way doesn't at all mean that the new Tritons are that way as well. I'm sure Korg have fixed old bugs and added a whole bunch of new problems!

regards,

-ED-