You needed a ram expansion to really get the best use out of it, but it really is amazing that they managed to squeeze an entire graphical operating system into only 64KB. It was slow, but it worked, and worked well. With a ram expansion, it flew.

My school had the old Mac computers in the computer lab, I would use them and then I'd come home and fire up GEOS and the experience and even the look was almost exactly the same. From 16MHz 512KB/1MB Mac's to the C64 with a CPU speed of less than 1MHz and 64KB of ram.