The OWS tool itself is incredible. I am still a noob (never used ListX), but following the tutorials found here and on DNN Creative, my application is coming together very nicely. There are some complaints about documentation and support, while I could use some more support myself, the documentation for ListX is very helpful. I have solved most of my own problems with this.
I make my assessments based on the tool, the documentation, and community support; kept in the context of It's FREE!
Thanks for all the great work on this.