I converted mine to type 2 a couple years ago using KYB shocks. The ride is a little firmer which I got used to very quickly. I always thought the rear ned was a little soft even with Goodparts springs. Durability? Two years isn't enough time to help you there, but I can't imagine they won't last for many years. Replacement costs, unless going with Koni or Spax, will be considerable less than rebuilt Armstrongs.