Summary: I got this lens as the lenskit for my GF5 and i was shocked to see that the zooming was choppy. This is not an ideal situation for filming (why allow the zoom to be used if the image goes out of focus and jumps when zooming). I come from a SONY NEX (5n) background and even though the standard zoom lens given with the basic kit is cheap and slow optically, it is butter smooth when zooming. I've ordered the 14-45 Panasonic lens as i hear this isn't an issue for that lens.
Summary: I bought this lens a while back to use with my EP-2 and have to say I am a little disappointed. It is a decent lens with a moderate zoom and focuses relatively quick, but the image quality is where things go down hill. Try to use this during the day when there is good light. If not you may find yourself looking at grainy and off color images. It is a very inconsistent lens. For everyday daytime use, this lens is not bad especially the lower cost.