I didn't know they offered that functionality, but it's a nice extra for outdoor summer listening! 
Any thoughts on how they sounded? (or if that was your review of their sound, point taken)
I heard them and they sounded pretty good. The room was quite large and they filled it nicely - bass was OK - clean but not super dynamic. For the price they are a very good deal IMO. I thought it was one of the better sounding rooms. Not very many sounded too good to me

One nice thing about the Kings is that the panels are modular - they use 7 panels and they can easily be replaced if needed. I like that idea.