I've been to Tong Thai many times since discovering it by accident a few years ago.
While from a distance you'd mistake it for being another average take-away (it's hidden in a small row of units on the outskirts of a housing estate), it's well worth trying out.
The thing that separates this place form other Thai restaurants in the county is it's focus on the food. The menu isn't too big, while offering something to meet most tastes. If you like Thai food, you'll like it here. The chilli chicken is a personal favourite, fresh, clean and spicy. All the starters are delicious as well.
The restaurant is small as you'd expect given its location, so it's worth booking for Friday/Saturday or large parties. You get somewhat of a family feel to the service set up, and they will always be keen to get another beer or bottle of wine on the table! The only thing I would say is that the tables can get quite close together, so if you are a couple next to a large table you might not be able to hear much.
Only had one takeaway and it was good, you'll find it's close to restaurant prices though (maybe 10% off?). I'd recommend eating in first.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.