My concerns are installation, possible performance issues and if there is any considerable differance between FSX default mesh resolution and my FSG mesh, 38.2 m res for Canada and USA ?Thanks Steve

I tried it when I first got FSX and It didn't work out so well! I think FSX renders mesh differently from Fs9 which may have been my undoing. I ended up buying the FSX bundle which at the time was very reasonable and I feel worth it.

I could be wrong, but I think the FSX default USA mesh is 38m...And the rest of the world (sorry hehe) is 76m, except for a few special areas...

HI Steve,Yeah, it will work, but it's not optimized for the new terrain engine. And the FS9 installers, of course, won't find FSX, so any install will have to be manual.The default terrain in FSX is 38m in the US, so you won't gain anything in the US using the 38m FSG terrain. You will gain in most of the rest of the world, though, as the only areas in FSX that are now 76m are Europe, Australia, small part of the southern Himalayas, Japan, and some south Pacific Islands. The rest of the default is 612m.But your best bet is to get the FSX Media Bundle at FSG. This will get you 10m US, 19m Canada, 38m Mexico, and the rest of the world at 76m, on 6 DVDs and 2 CDs, plus a free FSX landlcass download. And it takes advantage of the new terrain engine.-------Justinhttp://www.fsgenesis.netHigh Quality Scenery for FS200x

So will the FSX version work in Fs9 at 10m?

No. FS9 will choke on FSX terrain.-------Justinhttp://www.fsgenesis.netHigh Quality Scenery for FS200x