Just got mine today. It's great. Manipulating the fingers becomes kind of second nature after a while. I think for a child it may be too big. I just wish it had an on/off switch or a lights-only mode. The sound effects haven't become annoying to me yet though. As soon as you move a finger it turns back on. I think the battery cover should be on the inside, but it's not as big of a dealbreaker as it was for me on the Hasbro Stormtrooper helmet.
This may not be a smart idea, but I actually clipped the speaker from mine and the lights still work. The teardown is easy compared to the Star-Lord mask when people started modding those.
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I added a basic SPST rocker switch for the speaker. Simple to do:
1) Remove six screws from the electronics cover inside the gauntlet.
2) Remove two screws for the speaker hold down and lift the speaker up.
3) Desolder one of the wires going to the speaker and splice about 6" extra wire onto it (just to reach the switch).
4) Mount the switch on the electronics cover just off the side of the battery pack (there's plenty of room beside it).
5) Run a second wire (~6") from the switch and land it on the speaker terminal that you just removed the original wire from earlier.
Now you're able to use the lights without the sounds (reminded me of the seven dwarves mine train at disney). But if you still want to turn the sound on for whatever reason, just flip the switch.
While I was in there, I also put together a simple circuit to allow it to be ran from the batteries or one of the small 12V wall warts, only required a 78L05 regulator(since I used a 12v supply) and a couple of diodes. The female jack is inside the gauntlet, so not seen. I don't plan to wear it around, more of a display piece, but just like with the sounds, nice to have the option.