I do to and despite it`s finicky nature the X3 has enough high quality sound for me to stick with it. My particular unit seemed to have more issues than others, issues that Fiio said should not be happening and after weeks of daily emails with Fiio tech support, Fiio and myself finally gave up on my X3 and a new one should be at my door in the next day or two.
I want to give a two thumps up to Fiio tech support, they were there for me and we worked together daily, they understood my issues and concerns and never tired at trying to get my X3 working the way it was intended. I have never had this kind of support from ANY audio company. So thanks Fiio support & tech for all your efforts.