If it goes on sale again it's well worth picking up for a couple of quid, I think I paid less than a fiver for it. It's a lot easier to get it running than boxed FSX, literally install it from steam, fix the widescreen aspect in the fsx.cfg, max all the settings and install FTX, FSUIPC, weather engine of choice and payware planes of choice and go flying. I haven't done any tweaking to it whatsoever (outside of NV Inspector) and it runs like a dream.
Even more so with DX10. Using v2.7 of Steve's fixer and I can't believe how well it runs. Consistently <3.5GB Vas usage, and holding 30fps even in the VC of the 777 at a UK2000 airport. I've got a 4670K @ 4.4GHz and a GTX970, so not exactly top of the line kit and it runs perfectly. I'll throw some screenshots up later.