Best Part? Nice Girth (unusual for a rabbit). Worst? Length. I find it too short. And the "off" button has stopped working (maybe it wants to keep going and going and going? *L*) I have to untwist the bottom panel and loosen the batteries to turn it off.
The metal beads inside are a big improvement from the usual pearls in this style. All the others I've tried with rotating beads inevitably jam up and stop moving inside, no matter the design, but here, they've attached rows of metal beads to a single rod in the center that spins and these can actually handle the pressure of use and not break down on you.
I found the head to be a little too stiff, it should be made of something just a little softer.
So, improvements: better girth and bead style than most rabbits.
flaws: shorter than most, a little too firm and had some control button issues