I am using both an omega and an aurora. Both are excellent, as good or better than my sme345 and IV. I would buy the omega ruby if one becomes available at a good price
the Helius Omega and Aurora have a larger pillar so the hole in the armboard needs to be larger. As for the geometry, it depends on whether you get a 9 or 10 inch arm. My Omega is 9" and my Aurora is 10" with replaceable headshells. but I havent found anthing unusual about mounting either. I think the Ruby is a great arm, especially for the price. the 4 ball pivot just makes sense, and is very stable but with little friction.
Because its a very good arm, and with the Aurora, one of the few with replaceable headshells. The Omega and Aurora are nothing like the Helius Orion which I also owned at one time. They are easily the equal of my SME, VPI, Basis and other arms I have owned and used.
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