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I've only tried this twice now, but I did notice the results after the first use. Face seemed plumper and more youthful the next day. My partner even commented on how youthful I looked. I have bought this in conjunction with hyaluronic acid and I have upped my intake of water so I am not contributing the effects solely on this product.
However I did my research of the medical studies on derma needling and decided this was a wise investment for my skin and in particular I am using the .5mm needle for wrinkle and rough skin treatment. For the price I am really pleased with the quality of this product and like the fact that I have multiple needle lengths for different purposes.
You will need to buy sterilising alcohol in conjunction with this which can be purchased at most pharmacies.
Highly suggest you also do your research on Google Scholar for available studies to learn about when you can and can't use the product for your skin and its condition. I have read some reviews here that I now know are not accurate due to doing my research.
I wanted to try on my face and on my body and this comes with all different sizes for all your needs. I use the 1.5m on my tummy to hopefully improve my skin after kids and will use the .25 on my face to start. Was surprised on the quality for the price.