My main gripes with Still Life's production are the following:
Fuzz on the lead guitar. I only notice this when I'm listening with headphones. The leads sound crisp and clean on my computer and in my car, at least.
Bass drum too loud in the mix sometimes, comes off too punchy.
When the heavy part of Face of Melinda starts, the cymbals sound horrrrible.
Don't get me wrong, I love Still Life and it's probably my favorite album. It just really sucks that these little things keep me from enjoying even more. I'm really hoping the 5.1 mix will be released someday and maybe fix some of these problems too.
Anyway, I'm sure the GR production will be fine. Everything since Still Life has been very well produced (yay for SW!) and I can't imagine the new album taking a step backwards.