My 400i comes with the same PITA connectors that are a nightmare for old fingers to install. But my one saving grace (knock on wood) is that I haven't yet suffered from the very common (reportedly) loose connector problem, mine have remained tight from when I first installed them. Not pushing my luck by taking them off.
The new HE1000 has 1/8" regular plugs, I think they must have heard us. I would guess all future models would follow suit. I wonder about the new 400s, don't know about the connectors on them, the website is no help.