Once the cream of the hardware that runs unix, these are increasingly
passing into the realm of antique hardware. This is indisputably so
with the sun3 and older sun4 models, and with the advent of fast cheap
PC's that run linux, there seems little reason to even run the current
product offerings, unless you just have to run some third party package
that can only be hosted on Suns.
For now, let me offer you an old copy of the
Sun Hardware FAQ
that was once maintained by James Birdsall.
It is a real treasure for anyone that wants to try to fire up
old (and not so old) sun hardware.