I tried both... eCO2 Gel Ex &Mediplorer AACO2 Mask. I like eCO2 Gel Ex is better. eCO2 Gel Ex is the most expensive amongst the 3. I can't afford it for normal use but it's really good for MTS treatment.
Honestly, I tried both Mediplorer & ECO2 Mask, I do think ECO2 mask can get a whitening result while Mediplorer can moisturize and smooth skins after used. Compared with pricing, they are alike. Mediplorer texture is more dense than ECO2. The most feeling I like is that no dryness for more than 2 days when use Mediplorer while I have to put on some serum and cream to keep moist after using ECO2 Mask. It really depend on what result you are looking for and just make sure the product is "made in Japan" and not product from Japan. I tried another one called H2O, it is a fake product and you get nothing from the mask.