It may actually do what it's supposed to, I don't know.
Free version for evaluation converts 2 minutes of each file. So your evaluation of it can ONLY be an evaluation. Do you have time to download a program with few downloads and no reviews, install it, learn to use it, and then have a 2-minute clip to evaluate? I don't. I prefer to get something I can use from an evaluation copy. It implies that the creator stands behind the value of the product. Otherwise it's like test driving a car by sitting behind the wheel in the parking lot.