My 2002 F-250 SD currently has Monroe shocks on it that were put on in 2009 (45k miles ago)... They are shot and one seems to be leaking... Never again Monroe for me as the original ford factory shock...
Two years ago I replaced the OEM shocks with Monroe reflex and within 18 months my Duramax rode like a hay wagon. Replaced the Monroes with Bilstein. A night and day difference. Go with Bilstein's.