Historically, this lens was the my first purchase into the 4/3 system. Long before I got an E-system camera. Sounded like I was a lunatic, but back then, getting an 11-22mm lens in the shops was quite a rare occasion.
I loved this lens. It really has no equal. Large aperture, reasonably wide, and weather sealed. Put it next to the Zuiko Digital 14-54mm f2.8-3.5, and you'll be hard pressed to choose which is which. To the experienced user, the front element is the differentiator. It is a bit weird for it to have the 72mm thread, since the 14-54mm and 50-200mm sport the same 67mm thread.
At wide open, this lens is stellar. It has little barrel distortion, and has excellent flare control. Optics is top notch. The shortish 2x zoom factor is not a real issue, since it is 22mm at the long end and is pretty much a normal lens at f3.5 maximum. Not bad at all.
Put a polarizing filter, and the bright colors blossom in abundance. This lens has very high contrast and color tones. Primary colors are punchier.
I would like to keep this lens till today, but my desire to get the Zuiko Digital ED35-100mm f2.0 lens meant that I had to sell it off to fund the purchase.
I only wished I did not sell it...