Ive never seen so many bugs. Both pads suffer from things like kids profiles having to redownload (or do something) to every app everytime you open it. App crashes and slow launches every time it gets used (around 30 second launch times on both pads) Downloads simply do not get save to SD card despite clear settings saying otherwise. Accelerometer freezes. There's some kind of race condition in the app store so even though I've disabled it with parental controls sometimes you can get it to download an app without password.
One nice bug is that if you set up a kid profile it wont show ads on the lock screen. A fun bug is that if you delete the kids profile, it'll not actually remove the profile data, it just stays on disc taking up space. You have to reset the device to factory settings, but if you dont and you just leave the kids profile deleted it still thinks ones on there and doesn't show ads.
That's not all the stuff I've run into (initial setup had all sorts of other issues) but those are just of the top of my head.
Power management in those devices is particularly weak.