I gave this place a try for lunch.
First impressions were very good: the place was super busy, and we were designated a space by the bar rather than getting our own table. I definitely can't hold it against Sabai Sabai though - we didn't have a reservation, and this place is a very popular lunch spot in the Yonge-Bloor area.
What does irk me was the food. I had the Thai BBQ Pork - one of the more popular options on their lunch menu. Fast service is a great thing, but the dish came roaring out of the kitchen in less than 10 minutes after the order was placed. Keep in mind the fact that the place was jam-packed full. Unsurprisingly, the pork and the sauce was lukewarm, borderline cold.
I think that had I come in for dinner on a different night, my experience would have been much more positive. But for now, I'm disappointed.