I have Canary, I like it a lot. It's stupid fast.
Do you get the false "not responding" red lines on Activity Monitor? It shows Chrome helpers as not responding even though their fine. Been a problem for a while. Not a huge deal.
Yes (and it happens to Opera helpers too), though I also see some system services in red too. When Mavericks first came out, this also happened to Opera, it had no effect on using the software.
I've reported this in FA for PB1, I still see it in PB2...