Having now had three 621TS sets, I feel they're a bit overrated. So I guess I need to update my "favorite set" post a bit.
My favorite set would have to be a tie between my Federal Video 15 incher, as seen in this thread:
http://videokarma.org/showthread.php?t=269040
Or my late 1946 7 inch Transvision kit with the three channel tuner. Neither is operational at the moment, but I hope to correct that before Christmas.