I can't understand all the negative comments about this product. I tried it at the Apple store and I took one home with me. I'm an average sized adult male and I don't experience any cramping at all. I like the idea that the entire surface is a scroll wheel and I especially like the momentum effect. I've never had a single problem with right clicking...at all. It seems to me that there are critics that get off ripping Apple products so that they won't be accused of being a fanboy or something.
For what it's worth, I'm 66 years old and trust me when I say that I don't give a rat's patoot what's cool and what's not. If it works as advertised, I'll give it a fair shot and this mouse works as advertised.