It's overkill
Well constructed and I'm sure it works fine, but it seems to be overkill.  The silicone hot water bottle style of enema bag works fine, for less than half the price.  Given the short amount of time that the warm water is in the bag, and the relatively low temperature of the water, I'm not really worried about any chemicals from the silicone bag leaching into the enema coffee solution.
Rating: 3 stars