IMO the paints are pretty good, I use their colors almost exclusively. They are nice and thin and cheaper than GW and come in the same dropper bottles Vallejo uses. They recently expanded their range, before that it was a bit limited. The metallics are awesome.
I have also used quite some of their spray primers already: white, bone, green, blue, and black. I just had one can that sprayed grainy once. But that was my fault, the air was too dry that day and I didn't do a test spray...
The oil-based quickshade for dipping is... meh. I use it for terrain but rarely for models because of the gloss it leaves and the long drying time (also dipping is a bad idea, too thick). But the normal inks are great.
