I have about 50 bottles of Vallejo and I love them. They do need a matt or clear varnish but that's not a big deal. The trade off is super fine pigments that flow fantastically. I've airbrushed them, hand painted them. I've practically dipped parts in Vallejo with great results.
They are a superior paint to Tamiya and almost everything out there.
Get a set and see what all those Maschinen Kreiger, Armor builders are raving about.
Of BTW, Their gold set [Old Gold, Gold, Silver and Copper] are to die for. Their powders are the best in the business. I could go on.
Bob