I'd a little experience with VATSIM and as I don't have the best PC performance and with FS9. I start to use the "default" squawkbox and sometimes the weather conditions is not according from the real weather, I mean if it rains you don't see raining, but with the FsInn you see almost all. In other words:
" FsInn is a great set of software that has a lot more functionality than Squawkbox. Not only will you be able to connect to VATSIM and see other traffic, but the FSInn package also comes with some very enhancing features such as push-back, ground proximity warning system (GPWS; the voice that calls out on your final approach), and more that you can play around with. For some people the installation of FsInn is a bit more tricky than that of Squawkbox, but contrarily the program is not very difficult to use after reading a few pages of the manual. (English and French too)
Squawkbox tends to be preferred among those who just want to connect to VATSIM and communicate with ATC, and really nothing more. Upon opening the program you'll probably know what to do. With that said, it doesn't have the additional features like FsInn but is still a well-fit solution for any VATSIM pilot."
Finally, there are a number of people who have problems installing Squawkbox and ask for the support that they find on
http://forums.vatsim.net/ and on the
http://www.squawkbox.ca/ forum. There are a number of people that have problems with FSInn and find support on VATSIM forum or
http://forum.apollo3.com/ For the moment I use FsInn in my FS9 and rarely in FSX and its more reliable than Squawkbox, by the way I'd uninstalled Squawkbox from my laptop. See you next week E-J.