I compared the Nixon with the similar Ack! and immediately chose the Ack!. I have since compared it favorably to the EAD DSP 7000 III and with a very nice and smooth recent Van Alstine. The Ack! runs on batteries, always a major improvement, with the added advantage of no powercord to imrove upon. I've upgraded my Ack! significantly by replacing the 3.3 mF AuraCaps with Dynamicaps, a pair of 5 mF and a .01 bypass per channel. It really opened up and the bass improved big time. I use it with an EAD T1000 with a Mapleshade/Insound Zepher dig link. Extremely open yet smooth, dead silent with wonderfull dynamics; the best I've heard.