Thankfully got the tall version, as my handmade mobile ended up being too long for the regular size. Very easy to assemble, as it came in separate parts. In fact, you could take out one part to make it shorter if you think the arm is too long. It doesn't seem like it can hold too much weight, so I would suggest lighter mobiles (mine is made of cotton stuffed felt and that almost seems to be just fine). I don't use the music box since there isn't a way to mute and rotate, but it works great. Overall, it makes my baby happy which makes me happy. Thank you!