I tried this place out at the recommendation of a coworker who used to live in Thailand. He said it was the closest he's gotten to the food there, from a restaurant in Madison.
The place is in a ratty little strip mall, and they have 3 tables, a counter with a register, and the kitchen right behind the counter with nothing but a curtain separating whoever's working the register from the whole family working back in the kitchen. There were people eating in while I picked up my takeout order, but to me it's mostly a takeout counter.
That said, the food really is a couple orders of magnitude better than any other Thai place I've been to in Madison, and in plenty of other cities too. It's also way cheaper than other thai places. A typical curry is at least a quart and maybe 7 bucks. They do delivery through straight2yourdoor which tacks on a $3.99 delivery charge, but the food is so cheap that it still ends up worth it.
I don't care about their ratty little building with food this good, but they could work a little on their quality control. I've ended up with things like bay leaves and the hard, white part of the bottom of a green onion in my food. Nothing major, especially at this price, and the food still tastes great. Definitely recommended.