I use PC-BSD on one of my laptops, and it is actually faster than my hand installed FreeBSD 6.2 with Xfce running on top of it. The OS is nicely tweaked for performance and speed.
It is great as a desktop replacement and has been hailed as the Ubuntu of the FreeBSD world. It use KDE instead of gnome as a window manager, so it could also be seen as Kubuntu. I have it running on a 1 Ghz 256 Mb ram ThinkPad, and it works extremely well.
yip i d/l 300meg of updates first - pc 18.104.22.168 - now im updating everything from ports , looks and handles rather well, acpi is enabled by default in freebsd 5.x and above correct ? and seeing as this is based on freebsd 6 i should be able to boot normal and not have to select option 2 (disable acpi) because without that the laptop is a noisy bugger