My wife and I bought the same kit from Mondell as you. I saw a guy using one in the optics tent, he had bought from them years ago so we tracked them down. It is very comfortable to use and I like the quick release idea.
I also bought the waist strap as this distributes the weight even further and Elizabeth bought the guide pouch too as she carries Collins in the field.
They are a nice couple but the web site/credit card thing is a bit frustrating. He made the comment that they like to go away birding often so a website would tie them to having to process orders and answer emails daily.
I can highly recommend the design - the scope and tripod are no longer a burden and my sore shoulder is nearly healed!!
Which way is up?