I've used the inflatable booths for years and they work great. If you're using it indoors I'd say it catches about 85% of the overspray which is great for a self contained unit. Also just a thought what I do is grab some cheap furnace filters and spray those with hair spray and it'll save your filters that are sewn into the booth. If you're outdoors then I wouldn't worry about it. Also you may want to build a temporary structure around your project so you can shut the blowers off while your project cures and also it's a great safety catch just in case the power fails and you don't ruin anything.
Good Luck!!
Frank