I also found this video by Spud Tate about this very subject when I started trawling the internet for info on these paints. Spud I think has valid points which I agree on at the moment. But I still want to give them a go at least.
The range of paints do look really good though, I may transfer the ones I try into dropper bottles. But then that starts pushing the price up even more when you can get an easier alternative.
I'm thinking as more info becomes available and painters try them I may re-evaluate my initial thoughts on the product. But those bottles ?