One thing I miss from that era of machines was just the way they looked: at the time, most machines were grey or black boxes, but the SGIs had some degree of personality to them. The O2's were fun little curvy boxes. One of my favorites were the large rack systems - one of my jobs had us working with the Origin 2000 and PowerChallenge machines. Compared to some of the generic clusters of rack mounted Alpha systems that we had around the same time, the SGIs just had a cool look to them.