I very recently owned a PrimaLuna Dialogue 4 (that I bought from upscale), paired with my Red Wine Audio Isabella and Ginevra. It was a good sounding combination. I tried a few different EL34's, 6l6G's, KT120 and KT88's. KT120s were my favorite. The triode mode dulled everything WAY too much, not very triode sounding and the UL side sounded sterile - clear, but not very musical, if that makes any sense.
That being said... I sold it after I tried Dennis Had's 20(ish) watt SEP power amp. The Dennis Had poweramp blew the PrimaLuna away in every category except power - even with the same tubes I had in my PrimaLuna. In terms of Omega speakers I have SAM HO monitors and a dual 8" up and downward facing sub. Honestly, I think I am at a point stereo wise where I don't desire anything else.
Skip the PrimaLuna and take a look at Dennis Had!