I use to set timers for our favorite PTAT programs primarily for backup purposes, but I have grown to trust PTAT. So now, I don't waste any timers for PTAT programs. I leave PTAT turned on in both primary Hoppers for all four networks and all eight days. Sometimes when we are caught up watching all of our recordings we will take a look in the PTAT folder and find something to watch. We have discovered some programs that were good, so we now save and watch them all the time. I don't ever miss one of our favorite PTAT programs because the 8 days ran out. Every morning I go into the PTAT folders and check the previous day recordings for our favorite programs and save them to the My Recordings folder. I don't ever set a seek & record timer except to set a one time timer for a program that I had to seek and find it.
I don't have a problem with PTAT working right, but I have a tendency to let series get way behind and marathon watch, so I set them to auto-save to ensure they'll be there when I get around to it. It is mostly the dramas as I haven't found any comedies that are worth saving that way, but I usually end up watching them before the 8 days runs out. When I first got the Hopper, I used to check in the PTAT folder and manually save episodes, but that was too much of a hassle I thought.
As to seek and record, I don't use it much. But Boxing is on so many channels, even some I hadn't known had boxing shows, that I'm glad I did it that way. I do have it limited to only new shows, but even then some older ones show up in the daily schedule now and then when the guide info is either not correct or so uninformative that the timer can't figure out whether it is new or not.