9.4.1 is up to date and usable by all means, however, they use the sandbox technology in Adobe X, which isn't foolproof but yes, with all the issues Adobe had, this is a major improvement.
In truth, X is not an update but a rebuild with better security and not compatible with V.9 as an update, nor will it ever be. It's probably a bit buggy as most new things, but so far, it's working for me just fine. Open with protected mode is chosen by default and a good idea to have it that way in most cases.
I see when one goes to the adobe site and clicks on download adobe reader, when gets taken to the download of ADOBE Reader X
But if you go to the adobe site and click
and then click
when you click adobe reader-windows
you get update/programs to version 9.4.1
and there is nothing on there about Reader X
that mean 9.4.1 is an up to date reader to use?