This is good service, but then you need to know that some of these exchanges do send customers some notifications to their customers and at some point in time you may get both on email and other notifications like pop-up messages.
But it's entirely nice to see this free notification but not many will want to subscribe to them and sometimes, users of those exchanges will may be afraid of subscribing due to the fear of spam that goes around when you give a tour email to a random site.