Anyway, the women did their market research. Despite what the people replying here would or wouldn't do, I believe they will get a lot of use, and plenty of women will love them.
I have some experience with how market research is conducted (both as a participant and a market research assistant). In my view, the reactions here and the very many issues related to female biology and life not considered in the design tell me that there is an issue with the quality of the market research conducted.
I would not be surprised to hear that the designers specifically sought feedback from their ideal customer (this is common in market research), received glowing feedback from their ideal customer group and, because they are themselves part of that group, failed to consider the needs of other groups of women and so assumed their positive experience was directly transferable to other groups. Probably, as is only natural, because they don't face any of the issues we've listed above.
Certainly I could not imagine how hard it would be to go to the toilet with a sore knee. I managed it because I had time, privacy, and a cupboard to lower and raise myself. I could also clean up any mishaps in private. I know now, of course, but before that I couldn't imagine how a little pain could possibly turn into such a problem with lowering myself onto a toilet (let alone hovering over one).
And that is true for many other issues - if you're not pregnant, have never had a bloodbath of a period, incontinence issues, a physical disability, toddlers to accompany you and so on and so forth - it's easy to forget to consider what you don't know about.
As my friend found, who spent three years seeking patient feedback for a planned change of an NHS service, there is always someone you haven't thought of (in her case it was deaf and blind people, one of whom came to see her to suggest solutions).
And that's why you ought to widen your market research to include all kinds of women before you market your product to all kinds of women.