My initial impression was very good. Orbx global installed very easy. I installed Tongass by putting a copy of fsx.exe in my P3D folder and then using the registry fixer so that it spoofed Tongass when I directed the Tongass installer to my P3D folder. I had to put the terrain.cfg entries in manually and also the airport elevation entries manually. My thanks to Holger who gave me those tips. My AI works with the exception of the Tongass floats. I am still trying to figure that out. I pull a consistent 30 fps but I don't have all the sliders maxed. I do have the water at the ultra position. Opus works just fine. You just have to select P3D as your sim. I found that if I start Opus before P3D, the sim would CTD. No problem in starting P3D first and then Opus. I have both Anchorage and Fairbanks by Aerosoft and have both installed. Everything is smooth for me and I don't have a super system. Intel i7 990X @3.45 Hz, 12 gigs Ram, EVGA GTX 560 Super Clocked, 2 Gig Ram. P3D will use most of your processors cores always keeping one for the OS. I am running Windows 8.1 64 bit. The sim has some quirks when you port older aircraft but there are usually ways to get around them. I love the water effects and when you fly into a cloud, you are in there, not drive through thing like FSX. Just remember that you will have to tinker a bit to move you old stuff over.