I like it overall. it integrates pretty easily with Bubble and you get 300 free emails per day.
Only issue I’ve had with them is them locking the account after you’ve sent a couple of campaigns, they won’t tell you, so you’ll find out when you’re trying to create a new campaign and then you have to create a ticket and support will ask a couple of questions and then they unlock the account. Has happened for me a couple of times on different accounts.
It seems to be their way of doing customer verification. Not optimal, but if you’re aware it’s not too bad.