Matthew, welcome to the Mac. I read on your site that you recently came over from the dark (PC) side to concentrate on development of Mac Applications. Congrats on that decision. I just wish that you had started with something for which there isn't an excellent Free alternative like gmail notifr. I will say that I really like your icons better but as far a functionality goes gmail notifr has the same feature set almost blow for blow (multiple accounts, growl notifications, etc.) and gmail notifr actually lets you pick the interval at which mail is checked to be anything that you want instead of a preset drop-down list. I also like the fact that gmail notifr doesn't feel the need to tell me that I have 0 emails, it doesn't actually show me a number until I have some email to check. In fact, I cannot think of a feature that could be implemented in a gmail notification app that would make me want to pay for it over the free gmail notifr but that's just my opinion. Also I like it when I can actually demo all of the features of an application without it being crippled. I much prefer that the demo be time limited (even if it's a very short time) so that I can test all of the features. For instance I couldn't check to see if my google apps accounts would actually work in Gmail Studio. At any rate, the app seems to perform well and it does look good, my only problem with it is that I already have the same thing for free.