It does seem like Donic gets ESN's latest technology first a little earlier than the other brands.
So in Theory Bluestar would be a slightly different formula than the previous generation K3 and C53. But I havne't seen anybody compare it to the last gen to see how different it really is.
I haven't tested, but it seems like you have write.
Rumores said that the know how is in the sponge, not on the top sheet.
Who knows at the moment...
Personally I tried the A1 and I didn't reach a superior Level like Z1T to PRO.
Probably a question of technique.
At the end and for me the PRO's are a maximum, efficient and enough cheap against the hybrids...
Any other opinions?