I downloaded this today and paid $10 to unlock levels 7-30. I've been taking Skype lessons for 5 months, so I know how to read Thai pretty well. I have to say, I'm glad I found this app. I jumped right into Lesson 10. There's a good mix of vocabulary, reading, pronunciation, and sentence structure. Better than reading a book because each line of Thai script is clickable so you can hear pronunciation. Anyway, I plan to work through all the lessons.

I've been taking Skype lessons through learnthaistyle.com. You buy the materials from them and then contract for lessons through one of their teachers. That's been working out well too - I take lessons twice a week. I'm in the US and even though my wife is Thai, it's not possible to learn from her. The Skype lessons are not expensive and making the commitment keeps me from slacking off too much.