Hey Andre,
I have a Vision Pro + SDI.
Just updated to a new firmware, and it's even more stable and robust than before. I also changed my cable from an RGBHV breakout to a 5x BNC and the results are ever more fantastic.
Using DVE, the demos look like real life, they are simply amazing.
TV has also never looked as good as this!
I use pretty much every type of input this unit has to offer, and I would say that I use about 80% of its features, at least.
I have very little complaints and the ones I did have - I have passed on to Lumagen. They have done their best to resolve all my issues. In fact, subsequent firmware fixes fixed 95% of my issues, apart from those that extend beyond the hardware capabilities of the unit.
Their customer support and overall response to my emails and questions were nothing short of excellent.
I really have to take my hat off to these guys. They are doing a magnificent job and I wouldn't hesitate to recommend the unit to anyone.
If you do a search, I have an extended review of the unit (from a few months ago)
Regarding the price, these units are very well priced. A similarly featured unit would have cost quite a lot more only a few months ago! There is nothing within their price range that does 1080i->1080p (the HD LEEZA is listed at $4000).