I bought The Keeper about 20 years ago, and it was a wonderful money-saver. I don't remember how I became aware of it, but I didn't buy it right away because I was trying to have a baby and didn't want to buy the "before baby" model and then have to change to an "after baby" model. It cost about $30 then, so it did take some time to recoup the cost.
After the baby was born and I was recovered, I bought The Keeper, and I had trouble learning to use it -- I realized later that I was having trouble inserting it and having it "open up". The packaging suggested practicing on "light days", which was good advice. I needed several months to learn to use it well, but once I did . . . well, I won't say I loved it because I've never loved any feminine hygiene product, but I found it much more convenient and comfortable than disposable products. I often had slight pain with tampons, but since this does not touch the cervix, that was not a problem. I could empty it once in the morning and once at night, and in between I didn't think about it at all. Once I became proficient with The Keeper (and I emphasize again, that didn't happen overnight), I could do it in seconds and with no mess whatsoever -- literally, no mess. The two secrets are to keep the whole procedure over the toilet and NOT to remove the product completely, but just to edge it out and spill the contents -- practice makes perfect. I wouldn't wear it with white pants, but neither would I wear white pants "at that time of the month" with any other product.
The best part: No need to carry supplies.
The worst part: Never having been particularly regular, I was sometimes surprised at work and had to keep supplies in my desk. Being forced to resort to disposable products on those days made me inordinately unhappy.
I used it with great success for 17-18 years. I washed it by hand with dish soap at the end of each month's cycle, but never sanitized it in any way. Oh, the money I didn't spend after that initial $30 investment!
Then -- slowly -- I began to have some female issues, and suddenly The Keeper wasn't "enough" anymore -- and I had other problematic symptoms too. Eventually surgery took away the whole problem, and I don't miss that part of my life AT ALL. However, before those medical issues, The Keeper was an ideal product.