I own the Bee Stunning DiamondBuff for the body. I also own a Revlon Microdermabrasion Wand which is a dupe for the small DiamondBuff for the face.
The body tool has changed the texture of my skin on my arms, legs and tummy. It has greatly reduced the crepey skin especially on my arms. I use it at least once every 2 weeks and sometimes more. It's a great tool. Just don't over-do it.
The Revlon Wand is super effective and I can only use it once every few weeks. Some things to know about the facial tool...if you use Retin-A or exfoliate often with glycolic acid then be aware that the tool can be more abrasive to your skin and it can leave it red and sensitive b/c the tool has removed too much of the skin's protective layer (the mantle). If that happens to you then it will take days and sometimes weeks for your skin to recover depending on how you treat it. Do not over-do it or press down aggressively. Gently sweep in one upward/outward direction while holding the skin tight. Do not use AHAs afterwards.
One other thing. These tools need to be cleaned regularly and thoroughly for them to work properly and without damaging the skin from excessive pressure. It needs to sparkle like diamond glitter for it to be effectively exfoliating. I throw mine in the dishwasher occasionally and that deep cleans them.