I've now had the opportunity to use the Synylrez primer on a handful of miniatures.
First off - I used it on my latest commission project. That being some Super Dungeon Explore Kobolds. The minis are an odd plastic. Similar to the plastic of Mantic's minis (but less crappy). In this case I added water to the primer so that I could spray it from my Iwata Custom Micron CMB. This worked just fine. The primer went on thin and I was able to slowly build up coats until I got full coverage. When completed it was a very nice finish. I couldn't tell any difference from shooting it at full strength. This makes me happy because being able to shoot it from my normal airbrush is almost a must. I don't want to have to clean my Eclipse every time I prime something.
I've also now painted those minis and paint took to the primer just fine. It didn't strike me as being particularly good or bad. In fact, I'd pretty much forgotten that I'd used anything different after I got my basecoat on. Overall I call this a win. The primer proved that it could be a good base on which to paint. I also experimented with using a brush with this primer to prime the bases. This also went very well.
The second batch of minis that I primed were soft plastic Descent minis. I was really interested in trying it on these minis because I recently discovered that the Vallejo surface primer doesn't like this kind of plastic at all and will remain tacky on it forever. Thankfully, that is not the case with the Stynylrez at all. As long as you don't overthin the primer (which I did at one point) it covers the models well. No tacky problem. It holds just as well on this as everything else I've tried.
So far my opinion of the primer has actually increased since I did my video review. The more I use it the more I like it. I still wish it was a little thinner, but I can live with that. I believe that this is going to be the primer that I use from here on out.