No I have not ever used them and will never use them. And neither should you.
They are a scam and do not work.
Extract from wikipedia:
Pills
"Penis enlargement pills" or ointments are commonly offered over the Internet; these, for the most part, are scams.
Analyses performed by Flora Research of California and by the University of Maryland have uncovered harmful contaminants in a number of "penis enlargement" pills. Contaminants found included mold, yeast, dangerous E. coli bacteria, pesticides, and lead. Dr. Michael Donnenberg of the University of Maryland has described herbal pills marketed by Performance Marketing Ltd. as having "heavy fecal contamination", possibly from animals grazing near the plants harvested for herbal ingredients. There may however be a placebo effect i.e. a psychological effect of making the user think he has a larger penis, and increasing his confidence, when there is no actual change to his penis size. Some people have also reported that such pills make them feel horny, and give them harder erections, but again, without any actual growth of the penis.