@newyork - I get the expense, I really do, as I have a T&E sample at work, but purchased personally-expensive!
But I see it as a case of "buy once, cry once".
We have a couple of instructors who run an SRO-love that window. But most gravitate toward the ACRO with one fellow who loves the green 509. I've shot that in low sun and it does well.
If you held me to one, it'd be ACRO P-2 with a Tango Down front lens protector;that's what I bought!
My 2 cents...