After setting everything up, it *used* to work okay and would check for email from my three different accounts. There were even options to check in folders for things that were automatically moved with filters.
However, the new version seems to have removed a lot of capabilities - it's now web-based instead of an actual add-on, and the most annoying thing - it upgraded automatically and cleared out all that information I'd originally set up. Maybe it works, maybe it doesn't. I'm not willing to spend the time AGAIN to configure my three email accounts. A huge change like this without porting the configuration data over to the new platform is inexcusable. As far as I saw, there wasn't even a notice given. It was two weeks before I realized it wasn't doing anything.