I owned one for a few years and loved it. I sold it to return to Solid State and bought an Ayre KX-5 Twenty, realized I had made a mistake. Sold the Ayre and bought and still have an LS28SE and am happy again. By comparison the two are very close in performance and plan to keep this one. I am sure you will be happy with the performance of the REF5SE, it never left me wanting more. My issue was the heat and my limitations of placement.
As far as the hours go, it is hard to say since they can be reset at anytime, unlike an odometer. Enjoy and I only used AR tubes, but they are hard to get right now.