So I got my new (and first) rMBP yesterday (yea!) and have been setting it up today. I've installed the mac software for this mouse, the battery is excellent, however the screen response to commands is sometimes very sluggish. In particular, the scroll wheel is very slow to respond. I've checked settings and everything is set for fast performance. Same mouse/receiver works perfectly on my Lenovo Thinkpad. Any suggestions? Is there something native to OSX that might be conflicting with the Logitech software? Thanks.