I received the lens as a gift. The reach is lovely on this lens, 75-300mm (150-600mm=35mm), its sharp up to 200mm. The lens gets a bit soft at 300mm. The build is good, although I would like to see Olympus build lenses with internal zoom movement, meaning the lens overall length does not change.
Built; Reach and sharpness at up to 200mm
slow focus ; soft at 300mm