I went from a pair of TC-50's plus a single Spica Subwoofer to the Apogee Centaurus Minor. From there the Apogee Caliper(still with a single Spica sub), Magnepan 1.6QR with a single Vandersteen 2Wq, and finally to the Magnepan 3.6R with a stereo pair of Vandersteen 2Wq subwoofers. The TC-50's now reside in the upstairs office. The problem I had with the TC-50's was the necessity of keeping my head in the same vertical plane. The tonal balance and imaging would get messed up if you stood up or slouched too much in your chair. If I maintained the correct sitting position the Spicas were magic. I just didn't like being tied to such a small sweetspot, especially in a vertical plane.