I had never heard of this thing, but a little searching turned up some pantingly, frothingly, wildly, screamingly enthusiastic reviews such as
DAME Magazine :: Come on Ladies, Let's Vagina-cise! The Kegelmaster Diaries Continue
I believe that being able to inner bench press "all the springs" now ranks as the #1 desirable attribute for the fair, but muscled, sex. Build your own 356? Pffft - so last week.