With regard to Immelman using the Swingsetter on Academy Live and Leadbetter not mentioning it, I think that is probably a fairly unsubtle way of suggesting to viewers that the pros are using this device. I think that i highly doubtful tat it actually forms any meaningfull part of his practice life.

The Golf Channel is a very commercial medium and so you should expect to see this kind of product placement going on but I certainly wouldn't read anything into it.