Time will tell. I've only driven on them to and from the alignment shop where the "technician" after making me wait 2 hours, returned the truck to me still out of spec according to his printout. When I complained and refused to pay, he told me caster adjustment within spec was not just impossible, but unnecessary. Hmmmm.
Upon further inspection of the results, he was using specs from a 200 series. Pathetic. I'll head to another shop next week, but a my numbers (both before and after the "alignment" this guy did) look pretty close to the 100 series specs.
Try one of these guys:
http://www.sandiegowheelalignment.com/
http://eastcountyalignment.com/