Hi, I have a pair of Sonist Concerto 2 stand mounted speakers that replaced a pair of Reference 3A MM De Capo's. I went to the CES show here in Las Vegas for years looking for something that I would consider an improvement for around the same price as the De Capo's.The Sonist's were the ones I found that suited me and my system (5 watt amps). I did listen to the Zu's every year at the show and did not warm up to them, to me they did not convey the emotional content in the music as well as the Sonist's did, but they could really rock! The Sonists threw a huge soundstage and the high's are very smooth with lots of detail.If you are looking for a speaker to use with SET's I highly recommend the Sonists, the floor standers sound just like the stand mounted ones, just with more bass, at least to me they did at the CES show. Good Luck!