It has worked well all along, and there hasn't been much work done on it, aside from the upgraded rpm's - and the inclusion of the multilink parameter since xp came along.
But there are 2 things
1. 619 errors mean bad user/password, but also this can come from slow, or bad or saturated connections - eg. if someone on your network has blaster virus, you will get this.
2. the biggest issue I have is multilink with xp. I have two servers identical versions of sme - i can only communicate with one with multilink on, the other I can only use with multilink on. You have to be prepared to play with this.
VPN - PPTP connected more reliably with w2k as the client.