We as a company had moved away from using PIX because of the proprietary nature and complicated and convoluted to be complicated and convoluted to support the old boys network. After a year or so with Smoothwall we found UT, BTW from a blog post of the former founder of SW. Its features, functionality and ease of use was like a breath of fresh air. I care enough about UT that I want it to more than just survive I want it to thrive.
The bottom line is that IPSEC & PPTP are about as ubiquitous and universally accepted as you can get and UT must, must have this to be a viable product.