I have been working at Itsu full-time
Lots of opportunities for promotion if you are willing to work hard, high standards, staff parties and other benefits
Can be stressful at times, especially when you are understaffed which seems to be getting worse due to Brexit
I applied in-person. The process took 1+ week. I interviewed at Itsu in October-2015.
Apparently they do a lot of interviews for not so many positions, so they are very demanding. Best way to pass it is lying: say how awesome it'd be to work with them and why you love their company, telling them that in 5 years time you see yourself working with them... In other companies this would sound fake, but this is what they expect from you.