I have one gaff, a vagina panty gaff I bought from the breast form store. While I have no issues with the product, I barely wear it and it sits on the shelf collecting dust.
Main reason : It does a good job in doing what it is supposed to do; however I find when nature calls, it is a hassle to undo the tuck, then redo the tuck after. And being at my age, when nature calls, it screams so it is hard to quickly untuck just before having to go.
I do however have had good success without much tucking wearing vanity fair/vasserette type panties. They have a slight control to it so it does help keep things together down there.