I was more than a little nervous about trying Dermaflash. Despite watching videos, I did it wrong the first time, holding the blade angled the wrong way. No cuts, despite holding the blade backwards. One I figured it out (blade angled forward) it worked well. My skin is still smooth after 2 weeks so I will Dermaflash again about 3 weeks apart. The serum was only so-so but came bundled so essentially free. I wish there was a bundle with the Dermaflash and extra blades but it did not seem like an option. Overall I am very satisfied with Dermaflash.