It works; just have to find the right balance [SEP] I've used several times now and found that this works best for us if we use Gelish Artificial Nail Remover (since we use Gelish structure gel and polishes) to break down the polish.  We do take quite a bit of the top layers off before we steam.  I also put my fingers in on the H (heating setting) so that it does get hot and then switches to the steam setting.  I don't find the temperature to be so hot that I get burned, but I do have to pull my fingers out about 8 minutes in, cool off a second and then right back in.  Oh, I have had the steamer on and gone through the entire H (heating); S (steam) and W (warm) before I turn the machine off and then back on to redo the cycle.  We find this breaks the polish down quicker than if you put your nails in during the steam and warm only.  So, far using the artificial nail remover rather than acetone has not hurt the plastic tray so I believe this will work very, very well for us.  Two of us having been trying to find the best combination and this seems to work best for us.