Personally I would never use anything on my skin that I wasn't confident in, you should be able to feel good about what you're doing to help your skin heal, not worrying it might have adverse reactions!
I've heard a few bad stories about these rollers, but everyone will react differently to them, just make sure it's kept really clean and maybe test a patch on your face for a while and see how it goes.
On that note, I think anything with you apply to your face whether its a flannel/sponge/cleansing mitt/your hands - As long as you're massaging your face well you're going to get a similar effect. I'm a real fan of these silicone cleansing pads, they massage and cleanse, are easy to keep clean and it means you're not rubbing your face with your hands
You could also consider trying out some microdermabrasion products. Coconut oil also has a good reputation for fading scars, but since you have had acne you might not want to risk using an oil.