I was debating on harvested the Bry-97 from the Cornerstone. It was used in my SMASH pale ale. However, I don't see any recipes down the road in my pipeline that will use 97, so I doubt I'll bother harvesting it this time. I have some other kits coming that use 05, 1098 and a WYeast 1214 that I'll be harvesting.
I can't think of a recipe that asks for US-05 which wouldn't also work with 2nd generation BRY-97. IME, both are very clean American-style yeast strains, with BRY-97 being far more flocculant and the second generation of either strain being a significant improvement over the first. I would harvest and save myself $4 if I was you.