The comments about this being a 'crappy' lens came primarily from someone who hadn't used it himself. He made a number of comments without any basis in experience.First reviews of this lens were not positive at all. Also, go back to the first page and read a few comments from there.
Joe
I've had the lens since November, and it's a keeper. I'm taking it with the GH2 on a trip to Kenya this fall, when I'm going with a number of other photo types with equipment such as Nikon D700 and 200-400/4, and Canon 1DsIV with 300/2.8 and converters. I also have some longer Canon lenses and various full frame bodies to attach to them and have shot with the above combos, but am choosing to use the GH2 with 100-300 and some other compatible equipment. I don't think I'll regret my choice.
Henning