Almost 5 stars..
I love this Time Timer so much. I love the twist design, and that no matter how long you set it for within the 90-minute limit, the dial fills the whole circle, and that it shows the time countdown in the center of the screen as well.
I do wish, however, that there was an option to turn the alarm that sounds at the end of the time set off or on (so I could use it for work with out disrupting clients, and that the total time it could be set for/adjusted to would be higher (preferably up to 2 or 3 hours).
Other than that though, I love using it at home!
It would also be nice if it came with a built-in kick stand, so you could have it standing on a flat surface, or magnetized to something. And I wouldn't be upset if it came in more color options too (other than red).