I am a very busy woman, and undeniably, I do sweat a reasonable amount. Although it was never a major problem, I would have liked to been able to rely on a deodorant which promised 24hr protection, but unfortunately never found one that worked for me. I was recommended to use Perspirex by a colleague, and once I finally got round to purchasing it, I wished I had done it years ago! The roll on doesn't have a scent, and is very easy to use. Mine was aroun the £7 mark, which I was a little dubious before hand but I now realise it is worth the money. You only have to use a very small amount, just like a roll on, you do a quick swipe underarms and then go to bed (I would recommend not wearing your best PJ's whilst you are using Perspirex, as the roll on can leave yellow stains on clothing), Sleep, and then shower it off in the morning. I still chose to wear body spray, purely because I wanted to smell nice, but if you didn't, you would not be able to tell whatsoever. The deodorant protected me for about 3 days (I showered at least every evening). It was quick, and easy to do, and when I started to notice sweating again, I just re-applied. People have health concerns about Perspirex because 'It does not allow you to sweat which is a waste product', but it is only designed to be used underarms, or on hands or feet, not anywhere else, so I never found that a problem. One thing I would not recommend is putting Perspirex on after dry shaving. Ouch, ouch, ouch.
Aside that, the roll on is amazing, a really good buy.