i know six people with it and it does not work on any device!
Most have the 8520 and a couple have the 9700.
(Yes I know its only a BETA)
Hi, this is Steven the developer. Can you give me a little more detail as to how you tried it. Keep in mind that unfortunately this app, like all others, doesn't work with BBM. Just works for Phone, SMS and Email. The light will flash until you enter the app that was used by the contact. If you already in the messaging app when the email arrives, however, the light won't blink at all since you are already viewing your email list.