The 1.4 tip is the only one I have for that gun but I have sprayed epoxy primer, high build primer, single stage metallics and solids, base coats and clear coats. It seams to be a good all around tip. It sprayed the metallics very well, I didn't have any problems with mottling or striping.
I like this gun so much better I no longer use a seperate primer gun. I just take it apart and clean it really well, which is easy to do.