They seem cagey about whether or not the individual plan will have custom domains or support. That'd probably be the dealbreaker for everyone with single-user business accounts.
(Unless you're like me and still have grandfathered unlimited storage).
which tier are you that you still have unlimited? i was on the $10 tier (which went to $12) and then i got a nasty gram a while ago and upgraded to the $20 tier, i 100% only use my account for the unlimited storage.
I just set it up to forward all emails to my Gmail account instead. Works great, and it's free.