They aren’t advertising the new grey as providing more impact resistance. It’s “more accurate” and more resistant to “creep” under load.
Because I don’t have accuracy issues or creep issues the new reinforced material is what has me excited. I’m very interested to see how the material performs on thin sections. It’s harder and tougher than the other resins and should hold reasonably sized threads better.
Pretty much any thin walled part that is dropped is going to break. If you need more impact strength it’s probably better to go with a mold and a good casting resin.
For the things I do (both the real job and hobby job) a reinforced high temp resin would be ideal. Add tensile strength to the HT’s hardness and temperature rating and I’ll be very happy. Even if the HDT drops to 200c. If the materials team says the HT will stick to glass it’s worth looking into.