Delay sprays

Has anyone used delay sprays?
Do they work and what's the best way to use them?

I use this and have reviewed it https://www.lovehoney.co.uk/product.cfm?p=30900

Couple of sprays on the head, wait for it to dry and you're good to go. Would avoid oral as your partners mouth may go a little numb

I've tried one or two and find that they are hit and miss. Mostly miss however. For me personally they are mostly nerve concentrated and therefore target the head leaving the shaft still feeling normal sensations. I'd nearly suggest a cock ring over delay sprays as, personally, I find them to work better.