I've had four sets of front shocks on my Explorer - OEM, Autozone special (Monroe I think), Sachs, and now finally Bilsteins. The Autozone ones lasted less than 3000 miles of backroads in CO before they were blown out and leaking oil. The Sachs ones are still alive but were never anything to write home about... super impressed with the Bilsteins, I should have bought them years ago, they ride soooooo nice.
Have also run Skyjacker, Rancho and some others on daily drivers. They're OK, held up fairly well. I had Fox smooth body on the old race truck, two per corner on the front and singles on the back. Was very pleased with them, very expensive though.