I did 5 microdermabrasion sessions over the period of 4 months.
Important to note: The condition of my skin at the time was very mild acne (I got the odd zit). I was mainly going to address my red acne scars. Plus I was hoping to have overall better looking skin texture (that glow we all want).
After my first treatment I didn't notice much of a difference in the scarring but my skin felt great and clean. The microdermabrasion did not cause any further acne.
After the second and third treatment I kept taking photos of my skin and noticed that my cheeks had a nice glow to them and the scarring was indeed starting to fade.
I stopped after 5 treatments because I just couldn't afford the $125 each session.
Now that I make more money I am going to start going for more treatments. Living in a big city with lots of pollution I think this is a great alternative to a facial for someone that want's to focus on minimizing acne scars rather than just extractions. If you go to a good spa, they will play relaxing music, do extractions if you need it, and use a cool gel on your face after so that you leave with barely any redness on your face.
I recommend microdermabrasion for anyone who is patient (doesn't need a quick fix for getting rid of scarring) as this procedure won't clear skin after one treatment. You will definitely see results after a 4-5 treatments. I didn't notice until I starting taking photos of my skin.
It isn't invasive so the risk is minimal.
I recommend going somewhere reputable rather than whoever has the cheapest price.
I hope this helps!