Just had a set of MS2's installed on our truck this weekend. Our truck is only 2WD (17" tires) and we rarely, if ever, go off road so we didn't feel we needed the All Terrain tire. The MS2 is rated at 70,00 miles as opposed to the AT2 at 60,000. For us, and the way our truck is used, the MS2 is the better value.
Kevin & Janine
2006 Dodge 2500 Megacab CTD 2WD
2012 Palomino Sabre 32RCTS
Pullrite Superglide 16K Hitch