Thats an easy one Deano, if Accu-sim is engine man and a few additional sounds to you then Accu-sim isnt for you.
The code that goes into it isnt a case of when gauge a reaches this point then fail componant a which affects componant b and may then fail depending on c, b. Its far more complex, an example is measuring air temps at various points throughout the engine, from entry to exit, it is at no point the same, neither is the pressure, the fuel burn rate etc etc etc. For obvious reasons I cannot go into full detail on exactly what happens but I am sure you get the idea.
Couple this with actual flight physic changes, eg the cubs side slip is a first for FS in regards true behavoir of the aircraft during all phases as the physics are done outside of the engine, then the full suite of sounds that add to the immersion from cockpit sounds to environmental sounds that are dynamic and with Heida some of the FS first true thinking AI (again outside of engine).
ill stop there as I could go on all day. And the limitations of FSX is something ive already seen other developers mention when errors are brought up by customers, so I feel strongly in this area that its worth mentioning, as when the people say we would but we cant due to limitations that makes me wanna jump of a cliff
Accu-sim is aimed at the PMDG customer, those that want it 100%, Just as Alphasim has always been known to aim at the decent quality good price customer, decent models, ok VC's and FM's and a good price tag. We havent really ever been in compitition with Alphasim because we cater to different markets just like how the simplified justflight tube liners are not direct compitition to PMDG.
We are a niche market but you have to realise that even within the niche its split up so much into little sub groups Ideally you want to know which product to develop is aimed at which market.
And the price of admission? Well given the products we compete with in the ultra real market we are on a par with them when one includes the Accu-sim module. Without it,... well thats a whole different market and again we are just right in the price range IMO.