I've been using this series for several years. This was the original one I used for the first time. After that, I used Plus (because it eased the itching) and it was good, but next time I used Comfort (because it's gentle on the skin and has the same effect), but in my opinion Comfort is slightly less effective. I felt like it was weak, so I went back to Plus and used Plus all the time, but Plus was discontinued and I couldn't buy it anymore (sadly), so I wasn't sure whether to go with the original or the comfort, but the effect is the original. I decided on the original because I felt it was better. Unfortunately, itching occurs with all series, but if you don't apply it for at least 2 days after removing armpit hair or use it properly, you can avoid experiencing itching. When I get itchy, I have to put in some effort to cool it down with an ice pack or wash it off (I have sensitive skin), but even if I feel like that, Perspirex completely stops sweating, so I've decided not to use other products. I don't feel like using it. It's great that your armpits stay dry for 24 hours. The trick is to apply it thinly and smoothly on Thursday or Friday after applying it on Monday to avoid itching.