I've tried this app now over a month and it keeps my Mac online perfectly and stable. As far as I know this is the only app doing it.
Just start the application and you know what to do - the matter isn't complicated anyway.
A bit annoying is the price - 20 Dollar seems to be a bit much, half the price for non-commercial use would be allright and a help for all people which are still disconnected from their provider after 24 hours for example. And which don't want to allow any application to connect to the net automatically.
If the developper would change it to a pref-pane and the function into a background application it would be better - it seems that the developper thinks to do so in the future.