after owning the X5 for about 3 months now I have finally gotten around to listening via the LO - I had forgotten all about the LO option as the silcion case covers up the connectors and it wasnt until i read about someone pairing the X5 and pico power on another thread that it made me test it out
I paired it with the Meier Stepdance and my old IE80's and was gobsmacked with the improvement in SQ. Much more clarity and definition than the HO, the words crystal clear and authoritative best describe it for me. Can only wonder how my IE800's (recently RIP'd) with their rich bass and mids would have sounded with that extra cutting edge definition, i think it would have been a fantastic set up.
Also tried with my HD800's and it drove them very well but a little bright for my liking.
Overall a very pleasant discovery !