Whats wrong with using FSX? It's just as trouble free as FS9 as long as you set it up properly then it makes no difference. I'll never go back to FS9 online, because FSX is better.
The trubble wiv FSX?...

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The trouble with FSX is that many/most of my favourite Payware Utilities, which I use every day to enhance my FS 2004 Flight Sim, no longer work with, or are not available for, FSX...

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...eg:...
FS Navigator, LAGO FSSE/FSE/Soundscape Scenery Designer, FS 2004 EZ Scenery Designer....etc...etc...
Without them, I wouldn't be using any of Microsoft Flight Simulators...
..trust me...

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Paul...G-BPLF....FS '98, FS 2000, FS 2002, FS 2004, FSX.... 8-)...!
MS Flight Sim
without FS Navigator is a DEFINITE NO-NO for me!...

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...which is probably why "J" (John) cant get hos FS Nav to work with his FSX...

...?
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.