I have been using it for a few years now. Incredibly reliant, fast, and easy-to-use service for a very low price. They personally work to solve issues and develop solutions as soon as possible. They also have an API, so it is a gift that keeps giving.
I love this product. It really let's me use my single Gmail account with all my domains and I've found it to be reliable, gets through SPAM, and is so affordable. Highly recommend.
Does exactly what I need for free (email forwarding) with a clean, intuitive UI and great human support (which I only needed because I was curious about something)