FREE! is never a good selling point. Unless your goal is to not be able to maintain the product, you don't want to scream FREE!
Serious people who value their own time and that of their peers don't care if something is free or not. They want the best tool that does exactly what they need to do. Free is interesting, but ultimately doesn't matter if the tool is not accomplishing what you need it to do.
Free also attracts a certain type of individual who requires a lot of handholding. These people tend to complain a lot and not value what they are using. The switching cost for them is zero.
