Never been a fan of DX10.
Built a new FSX rig two years ago:
CPU: Intel i7 2600k @4.6GHZ
Memory: 16 GB Corsair Vengeance 1600MHz DDR3
Mobo: Asus P8Z67-v Pro/Gen3
GPU: EVGA GTX 770 SC 4GB
PSU: Corsair AX 760W.
Case: CoolerMaster HAF932 Advanced.
Even with this rig I never once thought of even trying DX10, as with add-ons like REX OD, Shade and others I am already very satisfied with what I see.
For me, I don't see any reason to spend $34 on something that I may only use once. A demo or trial version would have been an option.
Oh, I just read that it doesn't work with multi monitor setup's, so it's a definite "no go" for me.
I saw somewhere in this thread that someone was asking about ground textures, covering the whole world: Have a look at FTX Global and Vector.