I have the 509x now and really like it. I do not find it “analytical” in the sense it seems most people use the term in a somewhat negative connotation. It is not harsh for me, which is how I hear some amps others have described as analytical. Based on the audiodrom review the 590axii gives more “color” in the music which I think probably means a fully fleshed musical spectrum. Anyhow, I suspect you should give the 590axii a try, unless you just go ahead and spring for the Gryphon Diablo 300!