Gym Boss Interval Timer - Review

I have had my GymBoss Interval timer for a couple of weeks and I think it is a great piece of training kit. I use it for my own training as well as with my PT clients, and find it very versatile and easy to use.
Basically you programme in two intervals (work time and recovery time), shown in the picture as 20 and 10 seconds, and then the number of repetitions of the intervals. It then beeps and or vibrates to let you know when to increase of decrease your training intensity. It is light and small and clips onto your clothes meaning you are not reliant on constant watch checking to complete your training session accurately.
It is cheap and simple and does exactly what it is supposed to and I only wish I had bought one earlier!

Ben