Hello,
I'm enjoying very much the Beta and I'm surprised by how good Photo is, there are however two things that prevent me from enjoying it even more:
Currently, pressing a key for a tool will sometimes select another tool. For example, the B key will select the Color Replacement Brush Tool instead of the Paint Brush Tool, just like E will select another Eraser tool instead of the normal Eraser. I tried assigning a Shift+Key to all secondary tools, but it still didn't work.
Another thing that I noticed when drawing circles with the Paint Brush is that you can see the nodes of the drawn line. So when drawing very tight curves you can see straight lines connected by edges. If performance is a problem, maybe an option to raise the stepping would be great.
I'm on Windows 10 x64 and I use a Wacom Intuos 4L