Published Monday, 07 October 2013
Sharon with her three finalists, Shelley Smith, Sam Bailey and Lorna Simpson. (© Ken McKay)
She told This Morning's Phillip and Holly that while she was initially sceptical about the format twist, she soon changed her mind because it created an "electric" atmosphere for everyone involved.
This year at Bootcamp there was six seats waiting on stage for the successful contestants, with each Judge having to fill the chairs for their own category.
But if all six seats were filled, and the Judges loves another act, they could still put them through - but someone who already had a seat had to go.
"We were told about it the day it was actually happening and I'm like "what now? What are we going to be doing?"" explained Sharon.
"I thought "I don't like this" but then I loved it because it was drama.
"The atmosphere was electric and it really brought it home what this means to everybody, because when you see people on those seats and they think "this is it, I've done it, and I'm here" and then suddenly they're off, it's terrible."
Joining Sharon in the This Morning studio was her three Over 25 finalists Shelley Smith, Sam Bailey and Lorna Simpson.
During Bootcamp Lorna won her place at Judges' Houses when all six seats were filled, meaning she was taking someone else's place and she admitted that it was a very difficult moment.
She said: "It was very tough because I knew that I had come out to have a seat and I wanted to give it my all.
"It was just tough looking at everyone and I really didn't want to be the one to have to do that but ultimately I knew why I was there."
Sharon's Over 25 finalists will compete in the first X Factor live show on Saturday.
And she explained what she was looking for when she decided on the three ladies.
"You've got to think what happens on the X Factor, there's different themes every week, you have to take that into consideration, is you singer going to be able to adapt? A lot of singers can't.
"And also there is likeability and whether they have got the stamina to compete because a lot of people don't have it within them...they can't keep up with the pressure."
The X Factor is on UTV this Saturday and Sunday from 8pm.
© UTV News