
For those that don't know, Prepar3d is produced by Lockheed Martin, based on Microsofts ESP, which in itself was a "professional" version of FSX.
LM has tweaked and modified various things and P3D is now at version 1.3, with more updates to come.
P3d comes in 3 different license packages bepending on intended useage, see their website for details: http://www.prepar3d.com/prepar3d-store/
The download comes in 3 parts, at around 3.8gb, 4.1gb & 2gb each so a decent internet connection is needed! I downloaded part 1 at home, and the other 2 at work

After reading the download & installation instructions, I unzipped the files & proceeded with the installation. No real suprises here, pretty standard stuff, just make sure you read the instructions & follow the parts about "running as admin" or errors could occour.
Once installed, I fired it up for a quick test flight.

P3d launches straight into the default flight, so after a minute I was sat in the Mooney cockpit looking out at the runway.
Initial impressions were good, but it obviously needs a bit of tweaking to bring out the best in it. Frame rates were locked at 20, and that's where it sat. I don't have the most powerful PC around, a Q6600 o/c'd to 3.0Ghz, 6gb of ram & a nVidia GTX 460 1gb video card, which gives me adequate performance in FSX, with most sliders fairly high. AI traffic does tend to hurt framerates if turned up too high.
After turning on anti-aliasing, a quick flight showed it to be very smooth, and cranking up the autogen & scenery complexity to max didn't result in too much of a frame drop.
I'm going to compare settings between P3d & FSX, so I can get them looking about the same and see how it performs.
More later...