It's an amazing course. It will be challenging, but worth it, and you will be so much more prepared to teach than you would with an online TEFL in hand. You will get a crash course in presentation, grammar, and even pick up some Czech.
Most classes who go through the program bond tightly, and there's plenty to do in and around Prague. Minus a little bit of homework, you will have the weekends free to explore.
The staff and teachers are incredibly helpful, whether explaining concepts or helping you with jobs. They won't hand you a job, but they'll help you prepare all of the tools you need to get one, and are particularly helpful if you want to stay on to teach in Prague.
The only way you will do poorly is if you come in with a bad attitude, and want to coast. There is a lot of work involved. If you know that, and come to learn, you will have an amazing time, and will be totally prepared to start your TEFL career.