I have been playing with live styler for some time now...
Its fun for at home, and while i can play all yamaha styles nothing works straight out of the box. Everything needs to be eddited.
Since i work under Linux (i can use multiple vst hosts under Linux) much of the stuff i use can also be found in the mediastation, whenever i have a great setup for my styles it sounds better then on T3, with a good top of the line Quad core processor and 8 gigs of memmory i barely get above 70 or 80% processor power, even when layering multiple sounds on every track.
I use NI complete as the base of my arranger, but many other vst's in addition to that.
I only play in my home, and i don't know if i would use a set-up like this when gigging.
The solution is stable enough for sure, no crashes even when doing some very strange things. But somehow i think i would prefer a combination of arranger and solo synth when gigging with some of my VST sounds comming intoo the Mix as solo voices too.
I currently have an 88 key master keyboard connected to my PC set-up and i am considering a seccond (61 keys board) but i am also tempted to invest intoo adding a V-synth or an M3(KARMA)
IF Korg would add KARMA to the next line of PA arrangers, i would certainly buy it..
And i am still considering a solution like mediastation or Open labs (if they only allowed multiple ASIO ports) to replace my PC set-up.
I play all kinds of music depending on my mood, from classical to jazz, from european folk to house. Its all possible with a software setup.
Live styler is a good product and not too expensive, so just try it out if you want to, and get your own opinion, as that is what matters most. There are enough free vst's of good and stellar sound quallity to start out with before investing any more money...
Keep in mind that with the costs of these vst's its not necessarilly a cheeper solution then a TOTL arranger.