I am on the trial for 60 days, which is the equivalent of the $40 plan. Barring some disaster I will pay for the $40 plan.

I switched because I recently purchased several domains and needed a mail system for them. Google Apps isn't free anymore, and the free email forwarding from my registrar just expired.

I will still keep my personal emails on Gmail for now, mostly because I love Mailbox.app too much.