Summary: I'm surprised anyone likes this lens. It works like an old 70-300 Canon lens you can get for a hundred bucks for Canon Dslrs. Plastic and cheap feeling and when you try to zoom it sticks and grabs and I hate it actually. It's not worth the money and it shouldn't be a kit lens. It should be put under your boot and stomped, when I think about it.
Summary: Pros: 28-84mm focal length in 35mm equivalent with Pan 2x crop factor, OIS, great shallow depth of field Cons: very hard to zoom, not consistent, makes mechanical cracking noise, seems like my GX1 need lower F stop or wider Aperture in low light to compensate digital noise in videos... why it's not 12-60mm, at least 5x optical zoom!? Panasonic Point & Shoot cameras Leica lenses are better with 12x, 16x, 20x and 24x optical power zoom... and cheaper...
Summary: I bought one of these and had bad luck.. it was very sticky/jerky trying to zoom in and out; probably just a bad one, but I also noticed that it sort of felt cheap. I ended up paying more for a Lumix Vario 14-45mm and was amazed at the higher quality and advanced features with the OIS control, etc. Not sure if the image quality is any different, but...
Summary: I received this lens as part of a GF5 kit. Before purchasing the kit I was aware of its reputation of not being a stellar lens and yet I have still been disappointed. For several years I managed a professional photography store and tested many kit zoom lens. The Panasonic 14-42mm is one of the weakest performing kit lenses I've shot and it comes as no surprise to me that Panasonic is replacing the 14-42mm kit lens for their 2013 cameras.
Summary: I just invested in a Panasonic DMC-G3 system and got the 45mm Leica 1:1 macro, 7-14 zoom, and 45-200 zoom as companion lenses. I used a Nikon D2x with 13 lenses for years previously so have considerable experience with build quality. I was shocked by the plastic construction and feel of this 14-42, compared to what I was used to and compared to the other three lenses I bought with it.
Summary: I've been a professional photographer shooting Canon for over 30 years. I bought a LX5 as a "point and shoot" and it is an amazing little camera. I was thinking that the GF2 would be similar with even more goodness. Gave the LX5 to my wife and bought the GF2 with this lens. Even with the much bigger sensor prints side by side are not as good at the LX5. I wasn't expecting great from a kit lens but using this thing is unbearable.
Summary: I bought the Panny G2 with this kit lens and the image quality does the 4/3 format injustice. In fact this lens is so bad, even my DMC-LX3 format comes out ahead in image quality. Seriously even lens from P&S cameras will outperform this lens. It seems like Panasonic put all the bells and whistles on their camera body and then slap on the cheapest lens possible.
Summary: I found the "Mega OIS" image stabilization to perform well for video but overall, this lens has poor optics in comparison to the 14-45 and does not allow you to extract the full capabilities of Panasonic's excellent M 4/3 technology. It is much more "plasticy" feeling in relation to Lumix's other lenses and doesn't have the same level of attention to detail or build quality.