I use Android only on Xperia X, my secondary phone. And I have only three Android apps installed: one game, one online radio and one VPN authorization thingy (because my company does not support SMS authorization, damn!).

None of these have experienced any issues in 3.4.0.x.

OTOH, I have never, ever been able to install anything from the Google app store. If it isn't availblae in Aptoide, then I am screwed. I have GApps installed (the game requires it). I have Play Store in the launcher. I can browse the store. I can see the app. I can click the "Install" button. Then... it just sits there, spinning, forever.

This is not new to 3.4, it has always been like that. I have learned to treat it as a feature and to download and install the game updates (not available in Aptoide) manually.