Catco o2 sensors, worth it, or should I spend more and buy a different set? I've read before that these can go bad

 

From what I've read on this board, the general consensus is stay away from anything but the AC Delcos so I got mine from the local GM dealer for 50$ea. They listed for 74$ea. last June. Parts guy likes my car so he gives me the 'volume purchaser' discount. At least I think it's the car he likes . . .

 

Jason Chromer; ~$35 ea shipped... AC Delco's...