User blog comment:Theworldismine/How awesome is omniverse now?/@comment-4884507-20121211215337/@comment-71.55.210.41-20130525172139

The duration of the Omnitrix's charges seem to be fluid/debatable. I don't recall there ever being an established amount of time he could hold a charge for in any of the serieses though. And in Hot Stretch Ben did state that it could hold a charge for longer than that.

New voices and designs are mainly aesthetic things that people will have different opinions. As for Ben being arrogant, well... I didn't actually watch Ultimate Alien in it's entirety, certainly not the finale. I'd actually stopped watching Ben 10 completely before Omniverse came back out, so I haven't had a problem with his characterization; it's only because of Omniverse that I started downloading episodes of Alien Force and Ultimate Alien to watch, though it's been pretty painful to force myself to sit through most of them.

The thing about the Omnitrix controls though is a point I actually hadn't considered. Thinking about it, you are right, I don't recall seeing any misfires in the flashbacks, which is seriously weird. In the first couple of episodes, he claimed it was because he was having trouble figuring out the new controls, but you'd think he'd get better with it over time. That said, they completely lacked the misfires in Alien Force, and I rather missed them. It added another element of entertainment, plus forces Ben to get creative when he can't use the plan he originally had in mind. But kid!Ben should definitely be having more misfires, yeesh.