well i use to say that too, but I always finished the sentence with "unless they paided me" BUt since I's married now I apparently have to pay them because a good wife doesn't do it for money anymore LOL
I haven't had one but I know someone who does it regularly and she says it is great (I'm not really buyin' it but anyway). She said that it really takes out a lot of bloating and makes your system regular. She does them several times a year and swears by them.