I'd get it. Hey, even if you don't use it right away, nothing like an extra tank just in case Or just do what I did, set it up while their asleep, then wait for reactions in the morning....
great replies ! it worked ! i have kind of persuaded him and kind of TOLD HIM ! that I'm going to get it and its worked . I'm going to get it Tuesday hopefully . I'm going to ring the store tomorrow and check that they still have one and get them to hold one for me . I'm planning it out already ! will try and post pics when i get it sorted .