Being in Oz, I can't join you because transit time will be "yeast killers" as it is the middle of our summer, but I managed to find some WLP773 last year and used it a bit out of date (use by 18 Jan which is the middle of our summer but not pitched until the apples were ripe in April which is the end of Autumn or Fall).
Found it was very slow to ferment, taking two months to get from OG1.050 to 1.030 then another two months to get to 1.002. Not an entirely bad thing but a lot slower than SO4 which seemed to get there and stabilise in just over a month.
Anyhow the final result with WLP773 was excellent after six months just sitting around in the bottles (and getting even better).
I know this is a bit off topic, but finding WLP773 is a bit hard here in Oz. It seems that WLP002 is more readily available. Any comments on the differences, particularly retention of apple flavours and sweetness.