I bought a pair of them several years ago since i have a fetish for latex as well as enemas. There were numerous problems with them, as mentioned above.
First, the sleeve for my penis was altogether too weird -- the length and inside diameter were not a good fit and even though i went in just fine at first if i was erect, after a period of time, especially with the administration of the enema, going flaccid meant slipping out of the tube.
Second, as others have said, i could not get a good seal around the rear. i think the tightness of the latex pants themselves kept the inflatable insert from "seating" down around the inside of the sphincter, so although the enlarged size felt nice, it did not prevent leaks. In fact, since it was holding my anus open, it actually encouraged leaks.
Third, due to the rigidity of the tubing leading into the inflatable butt plug/nozzle, i found it very difficult, if not impossible, to sit down while wearing the pants. The pair i got was clearly meant to only be worn when laying down, and that defeated much of the enjoyment i had hoped to achieve from receiving an enema and then wearing the pants for a period of time, moving around, sitting, or going somewhere in the car.
Fourth, when i was ready to expel the enema, climbing out of that tight pair of latex pants was slow and awkward and usually resulted in a premature expulsion before i could reach the toilet.
So, for the joy of wearing tight latex pants with an insert in your posterior, it ain't bad! But, i quit using mine for enema play. It was far easier to just use a balloon (single or double) catheter most of the time. Please note that as a latex fetishist, i'm not usually in the position of discouraging anyone from wearing latex, but this was an idea that just didn't work for me.
Latexman 😢