Vacuum Cleaners Discussions

This is my first time on here. I stumbled on this site while trying to research a used vac that I'm looking at.  I currently have an aerus epic 3500 upright.  I like the machine, but would like to upgrade.  I'm looking at this used aerus guardian.  Can any of you pros tell by looking the approximate age?  Is this a good model or one to stay away from?  Would a brand new machine be significantly better than this?

I appreciate any and all input and info.

Thanks, Will