Here's a review of GWAN:

http://devopstom.com/blogish/gwan-snakeoil-beware/

Not very positive.

Previous discussion on HN:

https://news.ycombinator.com/item?id=4109698

Contains this little comment by me:

https://news.ycombinator.com/item?id=4109804

From the site (which seems to disallow copy-paste):

> The next time someone feels the need to publicly call G-WAN's (1-page) license "weird" or "insane", look at what they sell and who they get their revenues from. Unlike for G-WAN, what they offer is not free for all.

They have redefined the word 'free' into a fine mist if they expect you to believe Apache and nginx are not free. They're doing something I've seen done before; oddly, it was mainly being done by Usenet trolls.