I actually just recently tried out FreeBSD (5.1-RELEASE, to be exact), because I wanted to do something with my Sun ultrasparc 5 besides having it sit there and look sexy. OpenBSD was not an option, as I cannot boot the ultra5 from floppy (even says so in the README somewhere), and I was way too lazy to build a boot CD ala NetBSD's instructions, so FreeBSD it was - I wanted to use the box and see something new besides Linux and Win2k (and OS X in my dreams on the 12" PB).
In hindsight, I have to say it's great, it simply *works*. I am running apache2 on it and soon will switch my internal IMAP server (just for home, two users, collecting from various accounts via fetchmail and providing the results to internal IMAP clients) to that box. Maybe nfs/samba file server will be next so I can retire the Mandrake 7.2 installation on my current file server. :/
Of course, the machine is slow, a cd /usr/ports ; make distro clean takes about three days, but who is counting. :)
However, to finally get to the point (yes, I am bored today), installation was a bitch, to say the least, none of the terminal emulations the installer suggests is usable on the sun console. Usenet searches suggested a serial terminal (yeah, didn't have that under the kitchen sink), or a nullmodem to another box. I decided to do a "blind" install, took a couple of attemots, but somehow it worked and the rest is history - did everything through ssh from my desktop linux box.
I skimmed the release notes on 5.2, but could not find any mentioning of the sun console finally being a usuable install option, even though in my (previously mentioned) usenet archive search I came across mentionings of someone wanting to fix this. Does anyone know where it stands?