My review in summary: go, because the food is outstanding, but well before you're hungry and not when you're short of time.
Sabai Sabai is a revelation of Thai food. You can tell that the chef love his creations - they are both visually and gustatorily outstanding.
I've eaten here on a number of occasions and tried many different dishes. Amongst my favourites are the tom yum soup, crispy fried taro roll and massaman curry. The tapas menu is perfect for sharing and prices are quite reasonable.
The only downside is the incredibly slow service - a clear result of understaffing. My first time at the restaurant was to a packed house and there were only three servers attending the room (probably 25 tables). So go, but well before you are hungry.