A while back I saw some tests and review of the original version of this knife and it seems like an all-around solid performer. I personally wouldn't have any concerns relying on or recommending this knife as ones primary (or only) wilderness knife.

Knife Test
Knife Review

The only big negative was the serrations that the fine edge model shown here eliminated. For the most part, those that have a negative view of the knife do so based either on their feelings about Bear Grylls or the aesthetics of the knife itself. And frankly, neither of those things matter at all when you are out in the woods.

And, as an aside, the newer "Pro" version looks even better.