Have been using Personal VPN for xp and Ubuntu for about 2 years now, I live in UAE where VOIP is blocked yahoo, skype, etc. I have been happy with the VPN service, so far it have never failed to connect. speed is good, at under $4/month its a good deal. Witopia has servers all over the world even for PPTP users to connect through.
support is excellent.
speed could be faster, but for the price i pay i would say its fair.
GOOD JOB WITOPIA !