I don't understand all the positive reviews!!! Personally, I got fooled! So:
The main thing a timer should do is allow you to set the time as simply as possible and count down. Something that a simple digital timer with buttons does easily.
This one gets a 0 because you can only set the time with the bezel. So, when you turn it, regardless of how slowly or quickly you turn it, it starts adding seconds, and then randomly starts adding minutes. For example, it adds 25 seconds and then starts adding minutes. If you reset and do it again, it adds, say, 45 seconds and then minutes. If, for example, you want to boil pasta and set 12 minutes (the most common thing), it will add, say, 25 seconds and then you keep turning until it sets 12 minutes, so you end up with 12 minutes and 25 seconds. Then, however, you have to wait 2 seconds to remove the extra seconds you don't need by turning the bezel. Truly ANNOYING. There isn't even a speed pattern for it to recognize seconds or minutes, e.g., if you turn quickly it's minutes, if you turn slowly it's seconds.
The designer really rocked when they made this.
As a cherry on top, it's huge! 2.7 cm thick. If you put it on the fridge (99% will put it there), it sticks out like crazy! Hope I helped... Something positive: it's modern...