Without wishing to knock Meade, I must say that the views through a D&G 5" f/12 are beautiful. The mechanics are excellent. It's a pretty big tube though.
I have a 127 ed the color correction is excellent. The trick is proper collimation. I can't comment on the D&G since I have never observed through one but to get same color collection you would be looking at a lot bigger (F12-15 VS F9.3)scope and different mounting requirements. See Meade Refractor group in yahoo forum . See some of the reviews on cloudynights.com