I just received a new Metz 58 for my k20d. I will start to play around with it this weekend and give my more than newb, but far less than expert impressions.
It seems much better built that the Sigma 530 Super that I returned. It also is more powerful and I know there has been some discussion that the menu/button system is less user friendly, but it seems pretty easy to use.
The manual is pretty nice, too.
Plus, attached to the k20d with a 16-50 or 50-135 it looks so cool.
I am already a professional photographer. No need for classes, training, experience, or years of taking pictures and perfecting technique. All I did was order everything on the Internet. That was easy.
Gregg