Reoon Email Verifier does the job it's supposed to do and the results have been nothing but accurate for me so far. I'm glad I bought the lifetime deal as this will be an essential tool for my marketing needs. The API is very simple to use and integrates very easily and has helped me clean up my mailing lists. I haven't really had a chance to contact their customer support because I haven't really needed to since everything just works so I have no comment on that regard yet.

The one thing I'd like for them to improve on is the interface - it looks outdated and I wish they'd modernize it a lot. But since I mostly use their API, I don't really get to see their web app that much. As long as their service works, I'm good!