Waste of money or fun party ?

I'm thinking about hiring a soft play for my son's 1 st bday as usually you hire bouncy castles well he's too young for that so I thought why not a soft play here's the full set up

It costs £70 down from £85 they can drop off any time am and pick up 20:00 or earlier if u want they set it all up ect ..my family think it's a waste of money but I feel like hell actually enjoy this? Something to keep him entertained they're will be 5/6 kids toddler age so it will be fun for them too? I don't know my family is making me doubt it is it a waste of money?