I am no stranger to microneedling and the Dr. Pen brand as I own an Ultima A6S. After awhile it was finally time for an upgrade so I purchased this M8 and it has been great. It's significantly lighter than my old unit while maintaining the same quality and ease of use that I'm used to. I also love how they always come with a good amount of replacement cartridges that last for a fair amount of time. The one thing I miss is the spare batteries with my old unit but this one was a bit cheaper anyway. It's pretty quick to charge too!