Purchased this a few months ago and although we're nowhere near close to the limits of the account, have just upgraded - more to support the developer than anything after so many updates were pushed out consistently. Thanks George!

There's been a few negative reviews and criticism, so let's address that....

Does it work perfectly 'out of the box'? That depends on the quality of your data!
If you're trying to send a ton of spammy emails, you'll run into issues.
If you've not configured your domain properly or ensured you are using legit email address, you may run into issues.
Not because they don't care - quite the opposite! They want to be sure that every customer is able to use the platform smoothly for genuine emails... anything that threatens that needs reviewing. Simple.

We had a few issues initially with a Client's email delivery - support sorted it swiftly and changed the sending pool, but there were also a lot of issues with the emails being used.

Very responsive support, and continuous improvements and new features.

Highly recommended.