Fundsgon, (love the moniker) I had wanted to transition back to solid state or I would have kept the REF5se. But when I decided to go back I couldn’t afford a REF6, and although I am sure that the REF6 is far superior to The LS28SE, I am very happy with my purchase. In comparison the REF5SE presented a more defined deeper bass and maybe a more delicate mid range. But that said, the LS28SE is still breaking in, roughly 400 hours and only 200 on two of tubes. I had one tube fail and Audio Research sent me 2 and they are still breaking in. I am also breaking in the speakers and it is hard to say which is to credited with what I am hearing, but it is amazing the transition of the sq in the past few weeks. So in my opinion the LS28SE is right on par with the REF5SE. Yes there are differences, but I can’t honestly say if it is the speakers, the pre amp of both have just developed a perfect synergy. In short I am not looking back.