Reviews by bfields
Line them all up and play them like a xylophone, or hand them out to your friends and family and everyone can play together (thanks to the included 8 mallets). The household toddler enjoyed them immensely. (With supervision!--I doubt they're baby-proof.)
Surprisingly convincing sound, without all the hassle of dealing with actual bagpipes.

Turn the volume all the way up and march around your house playing "Scotland the Brave". It'll make your day.
Household favorite
Feels more expressive and fun to play than you'd expect from a little electronic drum.

Doesn't annoy the family as much as synthesizers that make noisy hard-to-tune sounds.

Takes about 10 seconds to boot, unfortunately. Once it's running, choosing a sound and playing is easy. Recording loops seems easy enough too. Fooling with the effects looks hard without the manual in hand (though there may be no real reason to do that.)

The clip makes it easy for two people to play at once.
These didn't really do it for me. The stylophone seems terrifically limited, the beatbox maybe a little less so but I had some trouble figuring it out. (And it seemed to keep running down the battery even when it was off, for some reason.)

Maybe playing with a stylus just isn't very satisfying.

But someone else might have better luck with them.
fun effects
Lots of neat sounds. Fun to plug other stuff into it and experiment. (Check out some of the other toys and plug them into the "aux" port; you'll need some cables, not included.)

The one little keyboard covers several octaves, so don't expect to be able to get specific reliable pitches out of it.

As with the other monotrons the headphone output is pretty noisy.