An Xono has been in my system almost two years and used with a Grado Sonata and a Shelter 901 on an SME V. Most of that time the TT was a Teres 255, then recently upgraded to a 320. The Xono is my only piece of solid state gear in the analog chain.
I'm in the market for a new MC cartridge, with Dynavector and Transfiguration among my choices. The Xono is so flexible in gain and impedance loading that I do not consider it, from the spec angle, to be a limitation against almost any choice. In terms of an overall balance of sonic virtures the Xono is, imo, a solid choice in the sub-$3k category - it should work well with a variety of cartridges. Feel free to send me an e-mail if you have specific questions.