I recently bought two of the new Mayflash controller adapter and am surprised by the fact that it has two USB connectors. The Wii U only has 2 USB ports, so if I use both connectors I can't connect two adapters at the same time. However, it also works if you use only one of the two USB ports.
The back of the box says that it "supports the built-in Vibration Feedback with no delays by plugging the two USB ports of the adapter into your Wii U system or PC USB connector ports." I've never been good at sensing input lag (I subliminally compensate for it) but other players seem to mind.
What I want to know is, how much lag will I have using only one USB connector with vibration feedback enabled, and how much with vibration feedback disabled?