FrancoX --
I do NOT have experience with the Omega Super 3XRS -- but I DO have experience with the Omega Super 3S. They are exceptional speakers. I have them powered by a Dared 2A3C integrated amplifier (8 wpc), connected with KimberKable speaker cables, sourced by a Marantz disc player.
I've had this setup in place since November, 2013 -- so far, about 120 hours on it. The sound is magical, beautiful, sublime -- the combination produces a full soundstage, great detail -- and it has a certain 'naturalness' to it that enables you to just sit and listen to the music for hours at a time.
My musical tastes are classical, jazz (Keith Jarrett, Jan Garbarek, Dave Brubeck, etc.), classic rock (Beatles, Stones, Jefferson Airplane, CSNY, Led Zeppelin, etc.) and miscellaneous (Enya, Loreena McKennitt, Kitaro, world music, etc.).
Without exception, it all sounds beautiful through this system.
One of the things that made it for me, too -- the price. Now, I already had the Marantz and the interconnect -- but the cost of the Omegas, the Dared and the KimberKables was substantially less than $2,500.
You can't go wrong with Omega's speakers -- Louis is doing a magnificent job of feeding our audio needs, and at the most amazing prices you're likely to find.