The good, the bad, and the ugly. I discovered the ugly before I started my trial of the Premium version, when I tried to uninstall Personal. I'm anal about running a clean system. Whenever I make a major upgrade I always uninstall old versions first, clean up leftover junk files/folders/keys, and defrag before installing the new version. As such it's been over 5 years since I've had such a problem. That streak ended. After finally getting it off and cleaning up, I installed the Premium version without the Proactive or Mail Guard modules. It ran just as light as Personal, with no noticeable slowdown with the Web Guard. Right now the memory usage is at roughly 8,000 K in Task Manager. I unchecked the exceptions in Web Guard for Video & Audio files & steams, just to see what impact it would have. Youtube videos were streaming at about half the speed they were previously. I downloaded a movie (avi) from a site and the speed was at about 60% what it normally would be. This isn't a critique, to be clear, I realize it's inevitable. I just wanted to point it out to others who may consider removing those exceptions. Since I run sandboxed and right-click scan everything before moving it to my data anyway, I leave them checked, and add archives to the exceptions list as well. I wanted to see how Premium ran with just Web Guard first, then try it with the Proactive module afterward to compare, and see if it ran heavier. I decided to try the "Modify" method in Add/Remove programs to add the module, and my computer froze. After a cold reboot I expected Avira to be crippled, closed umbrella, ect... but it was fine. So I elected then to do a clean uninstall/reinstall. Again it wouldn't uninstall cleanly. At least through these trials & tribulations I discovered another good program, Revo Uninstaller. It uninstalled Avira where Add/Remove programs failed me, and cleaned up most of the leftover junk as well (it did miss a few keys). Good program that's been added to my repertoire. So after doing a clean install with all modules (except) the Mail Guard, I realized that with the Proactive module memory usage of avguard.exe was up about 25-30% from what it was previously (without it). System cache usage was also up slightly, a negligible amount. But in reality, my system doesn't "feel" any heavier than it did without it. I notice no difference at all, and that's what really matters. And I run XP Pro SP3 with 1 GB of ram (dual channel), and a 2.4 ghz CPU. So I notice when things are bloated. Avira Premium certainly is not. So if I decide to purchase it I will add these modules, as they have no noticeable negative impact. And I personally saw the Proactive module work too. It flagged a suspicious file that was part of a game I have (Pod Racer). It was one of those files that automatically launches your browser after installing to ask you to "register" online. I guess technically it's a FP, but in reality I think it's doing people a favor flagging things like this, so I didn't report it. I don't want things launching my browser without my say-so. I like a product that will shoot first and ask questions later, and seeing this painted the module in a favorable light to me. The game works just fine without the file, btw. So my only complaint is the way Avira uninstalls, or perhaps more accurately, "doesn't" uninstall. But no other AV runs with my setup the way Avira does, and having Revo at my side eliminates the problem. In all likelihood I'll be purchasing this when the trial end date draws near. If anyone sees any discounts for it, I'd be much obliged if you could give me a heads up in this thread. Just wanted to post my personal experience since I think a lot of people are deciding whether to stick with Personal, upgrade to Premium, or go in a different direction right now. I hope the information might help some to make a more informed decision. But as always, individual results may vary, so give it a try yourself.