Many people have asked about framerate issues. Here are two screenshots with the head down in the cockpit using FRAPS.
Stock CFS3 B25

FirePower Series B17G

On a bit of a side note, in the early stages of development, we gave a bunch of stock CFS3 aircraft a bit of a face lift, to get used to the texturing system.
Here is an example of a B25 re-texturing job:
Stock CFS3 B25 cockpit

Re-textured CFS3 B25 cockpit

Just to make clear, the B25 above is not a FirePower series aircraft, but will be included with FirePower. There are forteen new FirePower series aircraft in development at the moment (brand new models, and not just variations).
There are so many really good things going in. I hope to get more details out soon. Also, we're planning on a Mid-Sept release.
Scott.