i don't use them, i used to find that so much moisture still collected at the bottom of the horn that the low e flat pad especially (since that is where all the moisture runs when the horn is in the case) used to perish very quickly.
that was on my yamaha and now i aint takin no chances with the Selmer.
the idea of swabbing the sax is to get rid of the moisture which causes pads to rot. think, a pad saver goes in, gets wet, stays wet, holding the moisture against the inside of the sax and the pads.
i use a yamaha swab, don't know what it's called but it's big and padded and triangular shaped, with one pull on each end so you can pull it in and out a bit to make sure you get all the moisture, and you can swab out the neck with it, although it won't go all the way through you can pull it in until it just reaches the end of the neck then pull it out, it's great.