I'm using one on my short film that's shooting on Monday.
We went over to the rental house and tried it out on my HVX last Tuesday and it was amazing. We hooked the camera up to an HD monitor and the difference was clear from the beginning. We shot something similar to an interview (an actor sitting in a chair against a wall with a chart on it) and you could really get a true sense of depth.
As for a lerning curve, your rental house should show you how to hook it up to the camera, get it going, change out the lenses, etc...it's an easy process and once you do it a couple times it'll become second nature.
They're great guys and are totally helpful. I rented the Mini35 package with the Zeiss Prime Lens Set which has an 18, 25, 35, 50 & 85mm...it also comes with a mattebox, follow focus, tripod and monitor.
Hi! What are your settings in the camera for this setup to avoid noise/grains?!? What's the iris opening for the camera?! What number should i put in (in the adapter).. What scene file do you use?!?