I've worked with both Omega D (and E) series enlargers and with Beseler Ms. I always preferred the rigidity and layout of the Beseler Chassis to the Omega, but found the Chromega heads to be much superior to the Beseler offering for color heads; less bulky and more reliable.
So, now I have the best of both worlds. My primary enlarger is a Beseler 45MCRX (the beautiful blue variety) modified to fit a Chromega E 5x7 color head. Great coverage and evenness for 4x5 with the oversize light source. My second enlarger is an older Beseler M (non-X, i.e. with the bracing beams in the front), which I have installed newer focusing bellows on and converted to take a Chromega D head.
I've got an Omega E (2 or 3, not sure) chassis with auto-focus and the "flying saucer" cold-light head sitting in my garage as well as an Omega D chassis too. I don't use these anymore, though.
Best,
Doremus
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