Anyone here who is using SendMails.io or Amazon SES for email marketing?

Hello @everyone, I found sendmails.io a cheapest way to send emails, as compared to other platforms which uses Amazon SES services, https://sendmails.io/ref/104/ Is there anyone who is using that or Which email marketing tool you are using please suggest, there are lots of like Mailchimp, Active Campaign, GetResponse, ConvertKit, Aweber Please suggest! Thanks