If you have a .20 cal rifle, can't hurt one bit to buy and try them. If they do and shoot well, go back and buy every tin they have and stash them away. Owning 8 rifles in .20 and the 7 kinds currently made plus a sleeve of H&N Spitzkugel's I got my hands on before AoA sold off the last of what they had. I would have bought every tin they had without a 2nd thought just to even have them.
Hopefully someone who actually got to shoot them when they were still being made will chime in on how well they did or didn't shoot but I'd like to think they would in at least one of the 8 .20 cal rifles I have.