Substance Painter : Hand Painting Surface Relief
Substance Painter is nice to use. I'm doing hand painted normals for large flat surfaces and the normals translate back to 3ds Max well. The tool could do with a straight line stroke or a de-wobbler, but apart from that I like it a lot.
I wish I'd started to use this program earlier when I first bought it.
For painting height, it speeds things up to grab mech alphas, like those from http://www.badking.com.au/site/product-category/alpha-maps/