I was behind too, but I downloaded r904 and r905 to check it out. The score reels and flippers are working just as well in all versions I have including r904. The only problem I have, and this is all revisions as well, is the flippers show through the backglass that is imposed at the start, and the plunger is very slow the first time it is used.
These nearly daily revisions are basically just builds towards 9.2.2 or whatever the major revision will be called. They are not new versions as much as test builds.
There is a modeled and textured plunger in newer builds so the complicated ball built plunger is not needed in these table updates.