Honestly, the thing I use the most is the timer. Being able to set alarms/timers and check their status without using your hands is pretty awesome. For my reef aquarium, I have to do a fair amount of chemistry tests that require steps to last a certain amount of time. This has worked out awesome for that purpose.
Otherwise, the things I use the most are weather and “flash news report” which gives a nice summary of headlines in my chosen topics. The kids can’t get enough of asking Alexa to play songs or “tell me a joke.”
For $99, I feel like I got a pretty good deal. $180 I’m not so sure about.