I used this in 1991 as an EE undergrad. I initially used it on my 8086, 4.77 MHz XT. It took several minutes to simulate a simple common emitter amp. I don’t remember if I had an 8087 FPU.

I then bought a 486DX, 50 MHz and the same simulation was finished before the mouse button lifted.

Fun times. Microcap was really cool at the time as it was the only GUI based SPICE, and the student version was under $50.

Nowadays I use LTSpice specifically since LT makes good switching regulators, and only develops those models for LTSpice. Otherwise I use Microwave Office.

MC still looks much more polished than LTSpice, at least the GUI. Schematic entry in LTSpice is still abysmal.

Yes also LTspice has some horrible clunk and bugs in it.