I've given it 3 months... cosmetically, it's fine, I like how it looks. But oh. my. god. The junk mail!
Unlike T-bird, it doesn't seem to have a learning feature, so all I can do is block senders after getting the spam. I can either click once to block the email address, or I can right click > Junk > Junk Email Options > Block Senders, Add, and manually type the @example.com.
So like today, I had 40 junk mails that were all the same, all with "SEO Optimization" in the subject (yes, "search engine optimization optimization"). All from different email addresses, so I had to manually block each of them. And this is a daily thing!
Worse, now I have to scan my junk folder several times each day, because half of the emails that it does filtered are good!
I use Gmail to IMAP to Gmail and have its spam filter turned off because it's too aggressive, but I guess that I could manually create filters every day to filter words or patterns. But T-bird did this wonderfully on its own... I rarely saw spam in my Inbox, and checked my spam folder once or twice a month because it rarely made a mistake.
I expected much, much better from a program that I actually paid for >:-(
