WHAT THE F%^&!!!

I've checked out just about every electronic and athletic store on my side of town and can't seem to find anyone that carries one of these. I have found a couple online. Does any body have any experience with these? The two that seem to be the most popular are "Gymboss" and another brand that's just called "Interval Workout Timer Model TMR03".

They seem to be just what I'm looking for but would just like a little input if any could offer some. Thanx!

http://www.gymboss.com/

http://www.fitnesstimer.com/interval-workout-timer-model-tmr.html