Is anyone here using the Nobel 688 primers in the 10,000 packs?

I have a pack of them, but have not yet run out of W209s. I'm told they are similar to W209s as far as load pressure goes, but I have no hard data.

I have loaded over 100k of these primers with very few failures or punctured primers.

Where can these Nobel 688 primers be found to purchase?

Thank you!