I did consider letting Gizmo go collarless as she is microchipped but then I heard some old ladies in a restaurant talking about local cats. They were saying if a cat doesnt have a collar on they consider it stray so they basically catnap them!!
There is no way now I am letting Gizmo out without one for thesse mad old ladies to get her!!
She has got out of her quick release collar once but this was thankfully indoors.