I turned it on, and think it is a very cool feature. 90% of the shows my wife and I watch are covered by PTAT anyway, so it offers a couple of conveniences - no worries about timer conflicts, no issues with the last scene of "The Office" ending up at the beginning of the recording of "Parks and Rec," etc. I have also browsed other PTAT recordings and sampled a few shows I wouldn't have tried before - some of which I now watch regularly.
On the con side, the recording grid in the PTAT folder can be a scary and confusing place. At first it helped to divide the shows up into folders by network, but now I just sort A-Z. It's still a bit of an eye test, so hopefully Dish is working on the UI. Also, I am not completely comfortable I won't miss a recording, and have it permanently deleted after the 8 day retention period passes. I wish there was a way to highlight shows that will be deleted soon, and also a "deleted recordings" folder for PTAT like there is for the client side of the HDD.