X Factor video EXCLUSIVE: Why it's been (err scientifically proven) Louis should get the boot

The X Factor judges wield their power over the acts on a weekly basis, voting off Johnny in last week's sing-off.

But are the new-look panel any good themselves?

We took to the streets (and asked our Twitter followers @YahooOmgUk) to find out which of the four mentors - Tulisa, Kelly Rowland, Gary Barlow or Louis - would get the axe if YOU had the choice.

Here's what happened when we did...