I have a Dot. Use it for music regularly, have a light that turns on with a command, ask questions of it sometimes, play games occasionally. Dot is okay for sound, if you want you can stick a pair of speakers with it and it will sound better than most of the other Alexa series, still for less. My step grand-daughter carries her Dot around (extra battery pack) and plays with it all the time.
Probably will get another soon for the bedroom, along with another wifi light and maybe a smart thermostat.
Around thanksgiving I'd expect a big sale on them