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Spent a couple of hours trying out AM15's surface baking, looking at the UV Maps it generates and then using the models and UV's in 3d painter. In contrast to the UV Tiles generated by 3d painter, AM's new surface baking feature generates tiles that are proportionate to patch size.
If you have a wide range of patch sizes this may be better than using 3d painter's built in capability, however the size of the gutters between patches may cause concerns(this requires more tests).
I really do like the extra detail on large patches though.

The next thing would be, that the unwrapper can although bring the patches in a none-distroted look. That would be a very nice unwrapper feature.
But sounds promising anyway
*Fuchur*

I tried this out today, but was pretty disappointed. Like John, I thought the adaptive patch size was nice, but the gutter problem is a killer. Even using only projection paint in 3DPainter I still got spill from one part of the map to another. A concurrent test using 3DPainter's decalling worked quite nicely, as long as I used projection paint.

On another front, I could not, for the life of me, get a cel combiner material based bump to bake into a map. Anyone had success baking a material based bump into a map?

Could you temporarily make it a color material (greyscale I'm guessing), bake it, then change the map's property to bump?

Yes, baking it as colour and then loading the image as bump works
I used the same model in 3D Painter with its' UV Tiles and double the gutter size (2 pixel border around each tile) The patch seams disappeared completely. so did a lot of the detail on the large tiles but I guess you don't get everything .