I tried it about a year ago when I was in a hurry and didn't think it was anything special. The pad thai was OK at best. I remember it being a lot of cheap thai food. Cha-am on Folsom and 3rd is maybe a 5 minute walk from the Cha-am express and I'd much rather order from the restaurant.
I had lunch there while at a conference at Moscone a year or two ago, and honestly I didn't like it at all. I don't remember what I had, but I remember thinking I wouldn't go back.