I bought the P3Dv2 version too. The difference to the FSX-version may be small, under the hood. Using the fsx-version the sim crashed to desktop after clicking the terrain-switch. Now everything is okay.
The brakepressure gauge works for me. The amount of changing if I press the pedals is very small! From 3.2 psi to 3.0 psi is the varying amount and I have to stay at the brake for about a second to see it. With the speedbrakes I have the same behaviour too: on the ground the lever goes to full brakes but in the air I can arm it. It's okay for me.
A very nice plane, I like it very much! No comparison to the first versions delivered. But: during descent there is no deviation point beside the altimeter tape to watch if VNAV works correctly or if I have do make some inputs. Is there a hint to make it visible or is it a bug? It would be very nice to have it!

Kai