Bit-sliced was certainly "interesting". It was the interim step from discrete logic processors to everything else. In addition to the Am2900 (and follow-on Am29300), there was the Intel 3000 line, the 74x181/381, MMI 5700, Fairchild 9000, Signetics 8x line, etc., etc. Many late 70s/80s/early 90s computers were bit-slice processors.