In addition to the letters not flaking off or wearing out, the DSA key profile is different than almost all keyboards made today. Most keyboards today have a concave profile for the tops of the keys that are basically uniform from the top of the key to the bottom. (I don't know if I'm explaining it well, but I think you understand just by taking a look at your keyboard).
Anyway, the DSA profile has more of a spherical concave recess, which cups your fingers more than current keyboards.
My first computer was a TRS-80 Model 3, which also had the DSA key profile and I love it. I'm actually saving up to get a keycap set with that profile to replace my current keyset on my daskeyboard mechanical keyboard.
