I've been to both locations of this restaurant - the one on Vanowen and Hayvenhurst in Van Nuys, and the other on Magnolia and Colfax in North Hollywood. Both locations did not disappoint, and I was extremely please with the prompt, friendly, helpful staff.
Some of my favorites on the menu: tom yum kai, where the bowl is big enough to share with at least one other as an appetizer, yum woon sen, beef salad, pad see-ew, and spicy noodles. Everything on the menu is under $10, with most (that is, not including sea food dishes) under $7.
I've never had to wait long for my food, and one day I brought a bunch of co-workers there for lunch. Some had never had Thai food before, and the waitress we had was very helpful with suggestions. Also, when we arrived, our food showed up on the table right when we got there because when we called to make the reservation, the woman who answered the phone said we could fax over our order ahead of time. This was great since we all only have an hour for lunch.
I will definitely eat there again. There is also a website, where you can view the menu, at http://www.winsthai.com