Yes, it is my home airport but I actually like SFO, both International & Domestic terminals are very nice: Not too huge, relatively new, some decent shops & quite clean. However, having a quiet lounge to park oneself on a long layover has it's advantages too.
Here is the link for asking for guest-help at UA RCC:
http://www.flyertalk.com/forum/unite...ar-2010-a.html
RCC's at SFO are worthwhile if you have been flying coach & want a quiet place to relax, play on the internet, have a snack & free non-alcoholic beverages (alcohol is served but it ain't free). If you do not get in as a guest, then paying $39 for one-time-use pass is not a bad way to spend a few hours in-between flights.