Having had the incredible opportunity to have a go of two real multimillion dollar airliner sim's (forever in your debt Ray!), all I can say is "I'm not worthy, I'm not worthy!". I sweated a bucket load on the 737-8 sim and it took me a good 3 hours to come down from that buzz and a week to wipe the smile off my face! It was a fierce and dark night over Sydney friends, lightning flashing and rain streaming across the windscreen. Turbulence was set to "Moderate". I can only imagine that the "High" setting would feel like being in a major earthquake! I haven't felt so behind a aeroplane since attempting my first landing in a Pitts (which almost ended badly!). My brain was in major overload and I could hardy fly within +/- 500 feet.
Had it been an actual flight, I may not have killed anyone, but the passenger cabin would have been flooded with puke! I can now understand how and why these sim's can be used as instruments of torture for those who do reach the lofty heights (literally) of flyin' and in command of those RPT "big babies" - with the immense responsibility that goes with it. It's enough for me to take 1 passenger - I can't imagine 100 to 500+ - nothing can simulate that! I at least understand and know now, what I don't know, ya know? It was a truly humbling experience, one I'll never forget! BTW, I've got a sneaking suspicion that Damo did a better job than I that night!
As far as PC sim's go for aerobatics, from my experience they can be fun, but replicating the real thing - hmm, that's a big stretch. Thing is though, it cuts into serious A/CAM time now anyway!
PC sim's don't remotely come close to simulating aerobatics IMHO. One sim years ago came close (in a visual and pushing the pole and pedals sense) in replicating spins/snap rolls for instance and that is Flight Unlimited (DOS based). MS FS (any version I've looked at so far is completely useless. PC sim's can in fact have a adverse effect if used a lot, as they will mess with your timing and muscle memory. It would be pretty well impossible on a home PC to replicate the stick forces at all the speeds/G-loads, throw in P-factor and Gyroscopic effects, etc, etc. Nothing can replicate the G-forces, which is why most military sim's are static (saves a lot of money too). Nothing can simulate the fatigue one feels after a few minutes of high positive and negative G.
There is no substitute for actual flight training and actual experience - nil, nada, none!