I have only used the Dr pen once so far. Recommended to do every 4-6 weeks. I'm due to do another session very soon. Even though it's early days, I've seen an improvement in my skin already. The m8 pen is easy to use and I'm really liking the post procedure masks to help calm and sooth my face afterwards. I was also very impressed by the quick service from Skinbay. I recommend purchasing from them. They have everything you need to start your microneedling journey.