I can see potential for both broad (the top) and somewhat more concentrated (the rim) vibrations. In my experience, Fun Factory's toys are pretty strong, so the vibrations will hopefully travel nicely throughout the entire toy. Plus it's a pretty discreet shape - it barely looks like a sex toy, so you could claim it as a fun-shaped portable shoulder massager or something.
And, I admit, there's the novelty factor. Like I commented on the product page, I wouldn't mind being abducted by aliens if vibrators were involved.
I'm waiting to read a few reviews, though. It's pretty pricy, so I'd like more in-depth information before I try it myself.