These days you can get color primers of various colors. Blues, reds, tans etc. I haven't found anything conclusive about the benefits using them however and most people seem to prime their figures either with white, black or gray. I understand using for example a red primer if you're painting a whole squad of mainly red figures as it saves time basecoating. But what about for other reasons? For example if you're painting a figure that's mostly in shadow, could a blueish (not pure blue but like Citadel's The Fang color which is bluish-gray) primer be good?
So, do you use color primers at all or just the white-gray-black spectrum? In general, do you see any situation where some color primer might be useful in the context of painting Imperial Assault? And maybe other board game figurines.
The reason I'm asking is that my gray primer is almost run out and I have to buy a new one. I was thinking about buying some other primer too if there's a good argument for it.