Uh, so I received an Extron RGB 201rxi for use with my XRGB-3 setup and I'm completely shocked, the difference in image quality's astounding! Color's more vibrant and accurate, the image is sharper, brighter, more detailed and there's a hugeeee difference when chaining the XRGB-3 into another processor.
240p (4:3) XRGB-3 > Gefen Scaler Plus looks better now than the Optoma! Don't get me wrong. The Optoma looks great, when you examine the picture it's clearly a few steps ahead in terms of clarity, sharpness and detail. So much, in fact, that it looks closer to a raw emulator image than a traditonal XRGB. Some stuff (CPS1 titles for instance) just looks harsh. The Gefen tends blur more of the lines together for a softer and thicker look which works in it's favor here.
PS2 480i (16:9) XRGB-3 > the Gefen looks really good, but the extra detail from Optoma easily outclasses it. These games used to look great on my 23" Asus IPS monitor and okay on my 37" LCD, which I attributed mostly due to size. It looks great even on the big set now, never thought I say that about 480i titles.
480p 3D titles (4:3) on the Wii actually look damned good!! After I made sure I wasn't hallucinating I checked out 16:9. Yup, still looks terrible. I'm confused about the jump in quality, I can't recall anyone here reporting something similar.
Some images (XRGB-3 > Extron RGB > Box1020 VGA to component trancoder > Optoma HD3000):
http://imgur.com/a/oK8hG