Thanks for this in-depth feedback into your experience with our software!
This is of course not the quality we are aiming for.
Our team is at this very moment going over all your feedback and are fixing the bugs you came across asap. We were able to reproduce the Sync issues with Arma 2 and this has our highest priority to fix. Other feedback is being processed and we will come back to you with a status update very soon.
PS: Play withSIX is replaced by Sync. Now the fact that you can't even use it right now is the worst scenario we can think of for something that should show you the future of our software. The problems with PwS being laggy and bloated are addressed with Sync which is a way more flexible code and interacts with your browser in a smarter way (when it works).
Once more, with all the bad experience you've had so far I'm really happy you came to us to report this as we do take this serious and want to avoid this in the future and fix it now for you!