Mailjet

The overall design of the platform as well as the email builder is one of the best i've seen. It makes it possible for even novice users to design templates and send email campaigns.

Price is a bit high compared to some open source and self hosted options like OemPro but for a SASS product its still pretty good.

It's really easy to set up and get going on a WordPress site, and I liked being able to authenticate by confirming an email rather than by DNS if I wanted.

Their TOS and enforcement of it is absolutely insane.

One of my sites sends transactional emails for the purchase of firearms accessories (think like holsters, nothing regulated). They blocked my entire account and all sites associated because of that. I removed the site they flagged, thinking I'd get my account back.

The compliance team then had to review my account, and then said one site I had linked which does landscaping is also against their terms because they don't allow real estate sales/related services.

I should note, none of the sites on my account were sending any sort of newsletter or promotional emails. It was all contact form submissions and purchase receipts.

The software is easy to use and I can prepare a "mailing" fairly quickly with templates that I've set up for various types of occasions. The price is very reasonable and the reports are fantastic. I'm able to reach my target markets better when I download the reports and track who opens and "clicks" through my messages.

Everything is great. I wish that there could be more templates for the emails to give me more "looks" when I do "mailings"

Ease of use
A plethora of features
Messages arrive to inbox (not spam)
Good analytics
Overall value is good

Mailjet limits your sending rate at first
Some features could be more customizable (e.g. subscriber forms/widgets)
Can be a bit complicated to add sender addresses and verify URLs