One of my favorites used up the last of my 15-pack supply during her most recent visit. I have used them with 4 ladies and in two doubles with both women wearing one so I could quickly move from one to another without removing and replacing a male condom. They are particularly good for that.
As to the way they feel, my perception is that they are slightly better feeling than wearing a male condom but not dramatically so. I think the wide spread impression that an FC feels like "doing it in a baggie" is due to the polyurethane formerly used in the first model female condom. Those were also said to have made a "rustling" sound while in use. The current model, the FC2, is made of nitrile, an increasingly popular material for protective gloves, partly because no one is allergic to it, unlike latex.
All four women had no problem inserting the condom and there were no problems with it staying in place, although I was, of course, doing my best to keep it pushed in as far as possible
I gather that wearing one deadens the feel for the ladies somewhat but if you want to try alternate stokes for alternate partners there is no safe substitute.
I imagine ladies might find using the FC2 less stressful in that it is not easy trying to put a conventional condom on a penis that is only partly erect whereas if he could get it in without a condom he can get it in with an FC2 safely in place inside her. The teenagers from Dallas who only do CBJ must find the middle-aged and older customers (most of them) a shock and trial if they are used to raging teenage boys as partners.
Where to buy? Here is one source:
http://www.amazon.com/FC2-Female-Con...+female+condom