I've seen posts about this card so picked one up. The good news is that CF cards transfer more than 2x as fast and I can finally use a USB 3 external drive but sadly nothing attached to it goes to sleep properly and I get ejection warnings when waking with my 4,1. I picked up Jettison as a trial and it seems to do the job so far but my real concern is that it's worse for the HDD having it "eject" rather than hard drives sleeping a few times a day. Also the external drives never sleep like they're supposed to so I have the app eject them when I'm not making a scheduled backup. Does anyone else have better luck or am I just being paranoid about having it constantly eject drives and remounting them?