Have a LS-25 Mk.I that I have been very happy with. Not sure how it stacks up against the Ref I or LS-25 Mk.II as I have not A/B those units in my system. The LS-25 Mk.I did better my previous Sonic Frontiers SFL-2 and Mark Levinson 38S by wide margins. The sound of my LS-25 has been greatly improved with both NOS tubes and full Marigo dot treatment. I also have had good luck with a CPCC Top Gun on the LS-25 Mk I. The LS-25 Mk.I also successfully drives a relatively long interconnect run (25 Feet) to my amp. Hope this helps. Good Luck.
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