Well, put it this way. I've got a GW-8 sitting next to my G70 right now. Is the GW-8 a hell of a good bang for the buck? You bet it is! Is it as good as my G70? Not even close!
The GW-8 cost a bit under a grand, my G70 cost me $3500 (when brand spanking new). And that feels about right.
Six Keyboard Parts as opposed to two.
Full VK Organ section as opposed to a fairly weak organ selection (worst part of the GW-8 soundset, IMO)
Full VH and mike FX section as opposed to nothing
Huge touch screen as opposed to small non-touch
Lyrics and score display as opposed to none
Full TOTL 76 action as opposed to a cheap (but still decent feeling) 61
Aftertouch as opposed to none
SMF Mar/Jump as opposed to none
Realtime sliders for all Parts as opposed to one data wheel for them all
FC-7 input as opposed to no hands-free options
And the list goes on and on.
Personally, I didn't buy my G70 under ANY influence of Roland's marketing, whether for good or bad. I am capable of deciding for myself from the SOUND whether it is what I need or not
Could I use a GW-8 or Prelude in an emergency? If I had sufficient time to prepare the Performances (they are not compatible, so it would take a LONG time). Would I think of making it my primary arranger?
No chance in hell!