Nope, no error downloading appz. It did however get stuck and "force closed" while downloading one app, but the app installed fine. This phone does have a few extremely annoying quirks though, and the all seem MIUI related.
1. Impossible to know what widget one is adding if an app has many options. E.g. Business Calendar has over 25 widgets available. The only way to add the widget you want is to go through the whole lot and see which is the right one. Simple vertical scrolling like all other launchers should be the norm.
2. Default apps. The Browser. If I change the default browser to either Javelin or Chrome, no links within any apps open. I just get a toast message saying "Page already open". I need to put the default option as the bundled browser for this to work.
3. While answering or making calls the screen will go blank for a bit under a second. This is more annoying when one needs to put the call on speakerphone, etc
Another thing I was looking forward to with Android 4.4 was Lockscreen widgets, and wanted to use Chronus, but those options aren't available in MIUI.