I going to preface this review by saying that, in general, I have lower expectations for service and decor at ethnic restaurants - that is why this got s 4 and not a 3.
Service/decor - I see alot of negative reviews on here citing bad service. I've been here on three occasions and each time the service has been white good. Granted, I was there weekend nights and not on a Tuesday afternoon. Decor is VERY nice compare to comparable restaurants in town.
Food - It always pleases me. I have found, and my Asian boyfriend has confirmed, that Sa-Bai is kind of a fusion between authentic Thai and what, apparently, a contingent of Madisonians want. I'm more than okay with this, as I have enjoyed every meal here.
Price - You pay for the nice decor and friendlier service. I'm willing to pay the extra 3/4 bucks an entree for that any night.