Years and years ago when there were no such slim & ultra-slim napkins, I've tried one brand with the guiding tube. easy to use. But...
(My feeling was): dirty and not hygenic---cause there would be direct contact with the used tampon (and sometime the bleeding lower body!!)---not to mention the adverse side-effects as said by many people.(such as 中毒性休克症候群 (see http://www.wedar.com/library3/bm000217.htm)and the direct absortion of many harmful chemicals like the bleaching materials through the vaginal wall.
Now with all those very slim and absorbing napkins, I don't see any need to use tampons any more.
(但如要使用最好還是選用天然產品的tampons,因始絡是內用喎!)