I think it looks pretty interesting, and would definitely want to give one a try. Do they have one you can use at the show? Here is a Youtube video from Sparrow, I think it gives quite a bit of info.
https://www.youtube.com/watch?v=UQ9RzQzWH0I
My guess is we haven't heard of them as they are a relatively new product, but I'm betting they grow in popularity!