Does it work? Yeah sure, however 2 things to note. 1: The timer sound is a single ding sound accompanied by a notification if you have those on, you can't customize the sound at all and can be quite hard to hear. 2: The alarm sound is a screeching high note that will make your ears bleed. You also can't customize this one.
2.7 GB is a ridiculous size for something, I think it is because of GNOME but other than that it is an awesome app! If there was a way to remove the GNOME part of it that would be awesome!
Heavy CPU load on the timer (15-40% load on all 4 cores simultaneously). Meets my needs but makes it challenging to use other apps while I'm using the timer.