I have themodel that came with my 2014 retina Imac. It's OK, I guess. Worth not having a tail, but the batteries last about a week-- Maybe the mouse never goes into sleep mode as a result of it being used on my glossy white desk. I'm tired of changing batteries-- and am thinking of changing it out for another version with built in batteries. Is the newest Apple mouse any good? Are there third party brands that are far superior to either Apple mouse?