My boss bought one a month or two ago for the shop. I don't think either of us has bothered using it yet. He showed it to me, my first thought was "Man, that looks like a real PITA to set up, unless you REALLY need it."
I bought a Lisle coolant funnel, the one with a couple different rad cap adapters. It works awesome 90% of the time, fill it good, burp the upper hose a couple times, then fire the car up and let it warm up. It worked a lot better before an old F-150 hood fell on it a cracked the old American iron cap adapter, I had just been using that one on the funnel, and the adapters for the pressure tester.