Works exactly as it looks like. I find the alarm sound a bit unpleasant, but the volume is quiet enough that it doesn't startle me. The ticking is so quiet I have to hold it up to my ear to hear it. I've found the angle it sits at to be good for a wide variety of situations.
On the negative side, it's not possible to see if the alarm is on from the front. I think this is a notable oversight for a device marketed for people with ADHD. Mostly because I have forgotten to turn the alarm on a few times and not noticed when the timer ran out. On that note, there's no discrete alarm option for an office setting. Also, I wish there were options besides 60 minutes. I don't want to have to buy Pluses for that, as I like the MOD much more.
All in all, a very helpful timer. I have two Time Timer MODs and am considering buying more so I can leave them all over the house.