Interesting technology and it would certainly take the misery out of threading an overlocker for most people. I would be very wary of auto tensioning and would have to have a very good look at the quality of the results. The noise of the Baby Lock would drive me nuts, the Elna I have is a noisy monster where the Bernina whirs but it is generally a stronger machine. They both have a wide right hand side gap which looks like machines that do a 2 or 3 thread coverstitch.
Most industrials like a Yamato Baby Lock or similar 5 threaders need to be threaded manually but sad to say I could not get one up the stairs. You can buy them for peanuts these days on the second hand market, less than I paid for the Elna that I rarely every use.