I was very skeptical at first with the complains that I saw on review. But once I started using the product, I could see and test the delivery. At first, the delivery shows less than 10%, don't panic. Over the next 2 weeks it picks up. I now have 99% delivery showing up.

I started sending emails for friends and family asking them to check if the delivery was in their inbox and they all confirmed. I used online email tester tools and they reported a before score of 20% and after score of 100%.

The biggest proof was that my clients started responding to my emails. All I can say is, Haters will hate. But this is a product worth the money. The UI can be improved upon, but I know it is not easy to do all it right at the first go, so I am sure it will improve. But the tech is sound.