Thats the 36 hour one, right?
If so Ive used it. I never had a problem with the first round but subsequent ones have been out for me for a while which is a waste of a seeking encounter. Viagra never worked for me so I thought Id give this a go. I have to say its amazingly effective. Can go for round 2 (and even round 3 on one occasion) now which is exactly what I was looking for. It even worked on the following day on one memorable weekend (one pill two days). Ejaculation is probably a bit harder but nothing that a bit of perseverance didnt cure. I do feel a bit flushed when first taking it but nothing worrying. So for me it worked as advertised.
Just an operational note: at boots, for any ED pills you need to fill in a form then they give you a slip to take with you for repeat doses. Its pretty expensive (36 for 8 tabs if memory serves) but I’ll probably go for cheaper unbranded versions when Im in a position to get home delivery.