And since they already screwed all their free users and early adopters you don't have to worry about it happening again (for a while).

I tried them a few years ago, everything was great except the email servers in the free tier had terrible reputation and most of what I sent was rejected by the receiving side.

I guess that's to be expected, free tiers of any email services are going to be horribly abused. Hopefully the paid service is better.