I love that phone. However, people who go the "there is no proof that calls are actually dropped" route should really reconsider their alcohol drinking habit. In other words, my iPhone 4, as well as all of my friends, are among those "very few phones" with issues. Yes, signal drops. No, my Nokia doesn't loose signal that way. Same place.
So, those people who say "I have the iPhone and I have no issues are either lying, deluding themselves something fierce (maybe they just dream of owning an iPhone 4, and not actually have one?), or for some reason got a very different phone than those I've seen until now.
It's not a crippling issue, people can get a plastic/aluminium/jobs-skin/leather case (like the one at www.jean-rousseau.com
However, the way Apple deals with the issue reminds us of:
-broken (exploding?) iPhones
Anyone remembers that? I do.
So, I keep my iPhone, and I keep buying Macs. But people denying the issue are just plain wrong.