Not too bad
I have two tubs...the new kind and an older porcelain tub.  Will not stick to either tub!!  The best I can do is put about one inch of water in bottom of tub, then put mat in to tub and try to suction it to tub as best as possible.  Then I sit in tub carefully covering mat with my body.  Last, I turn water on and fill tub then turn machine on when tub level is good. If you put on bottom of tub then fill with water before getting in tub....it will just float to top of water.  Try my directions and it will work fairly well. You will have to use your body to keep mat on bottom of tub. I just get comfortable with my bath pillow and a book and I do not move.  I see most of the reviews have the same complaint.  Either make it work for you like I did, or send it back for a refund.<br /><br />The noise people complain about is no problem. First...most whirlpools and  hot tubs, even the kind at the gym, make noise.  I think most people forget instead of being in a large room where the sound can dissipate, you are in a bathroom.  Of course it will be loud!!  However, I find that with  a nice book or magazine or just shutting my eyes and resting.....sound is no problem.  I kinda melt in to the sound:)<br /><br />When you are spending less than $100 for a bubble experience do not expect the same kind of results you would get with an actual bubble tub, whirlpool. This is the poor ladies spa.  However, it can be a nice experience if you make a few adjustments and I am sorry to say stop complaining about silly things like some people have in these reviews.  Honestly; the complaints about the noise is so silly.  Some people act they are going crazy or it is the worse sound they have heard. Hey folks....a machine in a small bathroom....yes it is going to be a little loud.  The last time I stayed at a hotel with a large whirlpool hotel in my room...when I turned that thing on I could not hear my Husband talk unless he was within about 7 or 8 feet of tub!  Try using the sound to block out the rest of the world! It works!
Rating: 4 stars