As an application that is only a countdown-timer, it’s worthless. There are dozens upon dozens of applications for free that perform countdown with far more options. If you want a paid application that is a timer / countdown timer, there are many others that do more than just perform countdowns and have much greater value.

I've used iBiz for over two years now and thoroughly enjoy it. iBiz has made my life much easier when keeping track of the time I need to bill for, sending invoices to clients, and collecting payments, storing the information in iBiz and iBank. This program has saved more time for me than I ever thought would be possible with a time-tracking tool. I had tried about half a dozen other tools before I finally settled on iBiz, and two years later, I'm really happy I did.
My one small complaint is that the new version if iBiz4 does not appear to contain a great deal of new useful features (for me at least). I think they took a small step back with the design as well, eliminating a few of the more prominent icons that I found extremely helpful.