Ken B.
I built the Dragon Pz. IV F2, and it was a fantastic kit, until the tracks went on. I lost heart in the middle of painting, and just set it aside. Years later, however, I had a spare set of Revell tracks, and although I had to take the model apart to a certain degree, and do a bit of fudging, I got the tracks to fit and the result was 100% better. Since then, my local HS was selling Revell Nashorns at clearance prices, and I was able to put Revell tracks on a Dragon STuG IV, a Trumpeter JgdPz. IV and a Trumpeter Brummbar. I don't know if I would have even bought those kits if I hadn't have had the Revell tracks.
Meanwhile, when I took the DS tracks off the F2, they were hard and brittle. Some pieces just crumbled into dust when I pulled them off, and yet they had only been there for less than four years. There seems to have been some sort of reaction with the superglue I placed them with.