Well, could not be happier! Have tried with Dynaco ST-70 and OTL. Prefer the Dynaco and will also experiment with a 2A3 PP amp this weekend. They are starting to open up nicely -- have about 150 hours. Also spoke with Fritz a few times over the Holidays and told him that friends and family members may be giving him a call to order some up. Folks were impressed with the low end and albeit my room is not "audiophile acoustically built", soundstage and imaging is wonderful. Purchased a Cambridge streamer and starting to play with Hi-Res downloads and can really tell the difference with the different resolution downloads available regarding soundstage. Interesting, the OTL topology really had the drivers moving compared to the ST-70. Lots of pressurization taking place! VERY satisfied customer and smile that such a small footprint can produce a large presence. For an amp and speaker combo <$4,500, cannot be beat.