I already have the 737-800/900 and the 747-400 & -400F. I just need some advice.I'm thinking of getting the 737-600/700 but wondered if there's any point if I already have the -800/900? They pretty much seem the same from a cockpit perspective, and if anything, the -800/900 has TCAS (which, as far as I'm aware, the -600/700 doesn't). So does anybody have both and can see a general advantage in having both?Also, what's the updates on the PMDG website do, in particular the one I've seen is the:737-800/900 Model Update - Updates your entire 737NG Series to the latest model and VC standards 30MB?When I click and download it, the .exe opens up and the title states it's for the -600/700 :-S so it's unclear what it does and what it's for, so could someone please explain?Many thanks,Kelvin D

Is it possible to have the PMDG 737-800/900 and not having the 600/700 ?Well, I first purchased the 600/700 and later on upgraded to the 800/900. But in fact you also get a new 600 and a new 700 as well, all of them with the same updated cockpit (TCAS included, of course).