There's a strong consensus among professionals that at-home microneedling devices are not recommended, especially for acne scars. The needle length required to stimulate meaningful collagen for scars is deeper than what is safe for at-home use, risking infection, scarring, and damage if not sterile or used correctly. They can't replicate the precision, depth, or sterility of an in-office medical procedure. They might offer very superficial improvement in skin texture, but not for true indentations.