Use every day
Ive used Howler (the free version) every day at work for a few years now. I love that it lets me set multiple timers, either as a countdown, or to a specific time. (I mostly use it to set timers that alert about 2 minutes before a meeting starts at work.) So while the Free version is all Ive needed so far, I thought $2 (or whatever Apple passes on) is a small price to pay to say "thanks" to the developer for this excellent app.
The sounds that come with it are silly but you can set it to your own sounds. For me, the biggest help is that it pops the window to the foreground when the timer goes off, letting me know its time to get to my next meeting. The best apps are ones developers write to fill a need they face personally, and thats exactly what this is - not some slick thing trying to compete with all the other overpriced apps in the store, but an inexpensive, solid little app that gets the job done.
tvjames about Howler Pro, v1.5.2