My buddy had one of these let me borrow it. After using it, I had to buy one of my own. What I especially like about this is the build quality - it's got a VERY satisfying feeling when connecting it to my MFT cameras. It's very sturdy holding the lens (I typically use a, admittedly light, 50-250mm EFS lens with it).This is a "dumb" lens mount. So your aperture is fixed at what you left it at, stabilization won't work, and you're stuck with manual focus only. This is cool as there's "smart" versions of these than I've read can mess up your camera. So I have peace of mind while using this. Just be sure to set your camera to work with "No Lens".I use this on an Olympus OM-D E-M10 m1 and a Panasonic G85 - works great on both.