While not quite a Sun system, I still have my Tadpole Viper. The only thing that runs on it in a straight forward manner is OpenBSD; even Solaris needs patch discs. I'd still use it regularly if only web browsers would work. I still prefer its keyboard and screen to anything else I've ever owned. It's the machine I was using when I finally was able to overcome my previous difficulties in learning C. And I even got to diagnose an endian problem.