My PBA league is currently on Bear. We are using the 2022 PBA Bear version. It's 41 ft long and a total volume of 30.6 mL of oil. It's not flat, but pretty close. The largest ratio across the different zones is 1.81:1, but most of the pattern is 1:1 or close to it.
I do best with some surface(1500) on a solid, symmetrical core ball playing up the boards to start, then as the pattern transitions a bit, I can move a little inside and swing it a couple of boards, but anything missed right is a washout and a slight tug and it crosses over.
Tough pattern and what bowling should me in my opinion.
On Edit: Forgot to add, we are bowling on AMF HPL lanes that have a very defined track from many years of league play. It would be much tougher on Brunswick Pro Anvil.