We have had amazing results with Biopelle and microneedling. With your acne scarring, I would expect to need at least 5 treatments 4-6 weeks apart.
Microneedling with vitamin C can be beneficial if your main concern is hyperpigmentation and brightening the skin. If you are looking to heal acne scars I recommend you use a stem cell serum or PRP (platelet rich plasma). These contain growth factors which will help to rebuild the collagen in the skin and heal your scarring.