Thoughts on Panasonic Lumix 100-300mm II

I'm looking for opinions from people that have or currently own this lens. There are a lot of reviews out there but they're very mixed. I mostly focus on landscape photography, so I don't need anything mega-fast at focusing, and video isn't something I'm bothered about. I already have the 45-150mm Panny lens but I want something with more zoom, so would this be a good addition to my kit?