I just did a fresh install of pfsense on P3(500mhtz) with 384mb ram and 6GB disk.
I think this is by far the cleanest install and least buggy software I have seen. I have a site-2-site vpn with linksys, PPTP server, dyndns, etc.etc.. Also have seen that pptp passthrough also worked like a charm right out of box in default installs. The only change I made, when installing, I deleted the swap because I saw no need for that since my machine has so much memory. I have a 2GB DOM (flash in IDE). Is there a way to use the software by installing it on flash. I don't want to loose any of the flexibilities by going to embedded version. Memory/disk etc are so cheap these days ..............
