I have had them for a few years. Of all the things I have tried I think that these videos helped be get my HI down to 13 from 20 since the swing "thoughts" in the video are easy as a "go to simple swing" on the course. I recommend these videos. I will say that this swing promoted much more solid contact (from my tendency toward fat or thin) but a tendency to pull the ball a bit.
PS- the other training aid I think is really good is the whippy tempo master (I have PW, 5i, and driver). It really helps your swing since if you try to "hit" the ball the result will be lousy.
Hope this helps somebody out there.
Elliott