Product review (4 stars): There's a learning curve!
Using this for the first time reminded me of the frustration I felt trying to learn how to drive a stick shift - not gonna lie, it kinda sucked! You have to figure out how to do a few things simultaneously AND you have to let the thing do the work - that's what the spin feature is for - but if you press the wrong side, it will spin the wrong way. There's also a threat of getting your hair wound up and stuck, but again, let the brush do it's spin thing and you'll be happy with the result.
This is NOT for short hair - both brushes are designed for medium/long styles. Your hair should be partially dried for the best results and you'll be happier if you work in sections.  Mine turned out full, smooth, and bouncy.
This tool is NOT lightweight - it took me 15 minutes to achieve the look I wanted and by the time I was done I had a tired achy arm - likely from getting the hang of it and my control-freak death grip. The weight is why I'm giving it 4 stars instead of 5.
I like it and I will continue to use it - the results are comparable to what I get from my local blow-dry bar, but WAY more economical!