I like that it works with other providers, so if your domain is hosted elsewhere you can still use this service through their API's! It has been great for my business as we've had people sign up using our website but then they don't have an account set-up in Gmail when someone emails them directly from another provider (eBay). We were able to verify all of those accounts without having to wait until users verified themselves via Google+. That was very helpful because many customers are unaware how easy verifying yourself really is. Sometimes there will be issues where some addresses get "stuck" after being submitted - sometimes requiring manual intervention by contacting support@verifyemail.com. Our team uses VerificationEmail daily at work. The benefits include more reliable customer data & quicker response times due to less spam/junk mails received. With greater reliability comes better management.