PLEASE READ: not commenting on the durability. However, LOSI has updated the rear and front diff cases. They will not work with the old version pinion bearings that have an 11mm OD. The new cases use larger bearings with a 13mm OD. Check your bearings before you order incase you need to order new bearings as well. I wish Amain had a note when I ordered. Now I have to wait for new bearings to come.