Got it, thank!

Installation takes about 3-4 minutes, all nice and bright now.

Didnt have to do any exposure compensation (b/c i am normally shooting
with old Zuiko lenses, and they require a tic of underexposure, so its
great bonus :)).

Middle line of split is slightly above the AF spots line. Guess this
is why AF keeps working just fine.

Only real problem is that at 4.5, 5.6+, on some angles - upper half
is getting completely darkened out (guess this is light fall-off thing)

And i really like this split to be diagonal :) and may be circle a tad
bigger.. E500 viewfinder, even with ME-1 eye magnifier isnt very big :(