Personally, I went with the Cinevate's Brevis MP2 as portability/lightweight is an issue for me.... but it would have been really easy to have chosen one of the others.
I think the main thing I did learn from the investigation is that the quality of the 35mm lens you stick on the front is at least equally as important as the adapter kit. The Brevis has an older Nikon mount which will allow me to put a really good, fast Zeiss lens on it.
Can't report any results on the Brevis yet as it only arrived a couple of days ago and I am up to my ears at the moment so haven't the time to really try it out until next week or the week after.
Please drop me an email if you want to know more - josephmorgan at dublin dot com