I got the Anakin Skywalker edition a while back when I started college, again, last year.
One set of batteries--never had to replace em, and a whole bunch of "never been late ever" later, I have a good reputation, and a great knack for organic chemistry. I also knock him off of his perch all the time.
Get a clock, learn Organic Chemistry.
Pros: long life, loud enough--but not too loud or annoying. Reliable and ULTRA durable.
Cons: no 24/hr time