Usually a Tether works in basically the same way an EyeFI card would. The file saves on the Card and then transfers to the computer iirc, I don't believe it bypasses the SD Card.
I just want it set up so that I don't shoot in RAW+JPG and have to wait 10 or 20 seconds for the last shot to pop up as I shoot faster than the card can transfer files.
Then I have to Transfer the RAW files over separately however if I'm working with someone who has limited time, often times they don't understand that so you do your quick edit with them on the JPG's.. just adds more work for me later on...
Shooting just in RAW having the files pop up in Lightroom have my quick adjustments made right away would be much faster.. and the power of USB3 means the photos should show up faster than the JPG files with the EyeFI.
I'll need to get a Tether Tools Cable I think as I need 15ft I think so I can move around my space, it would be so helpful to me.
Right now I'm frustrated because they put the time frame in the file.. if they can't meet that than it shouldn't be there.