Funny that I just saw this post today after so many months.
IME, I've had nothing but success. I have to agree w/lvmommy that it's a long, arduous process, but for me, it was & is totally worth it. I began doing it in Oct. 2003 & try to retouch every 7-8 months. Prior to today's retouch, I last did it in July 2004, so I got as much mileage out of it before returning.
The downside is that you can't wash your hair for 3 days & can't have any "movement" such as ponytails or buns which may cause curling to occur. However, the portion ends up amazingly straight & regrowth didn't begin until the 6th month or so. My hair is soft & silky & so much easier to handle.
I found that if I wash my hair every other day instead of daily, it helps out tremendously w/preventing any dryness. Plus, I use a deep conditioner weekly & use a spray-in conditioner overnight. I try not to blow-dry or flat iron my hair & saw that the shine is still in tact.
It
is a chemical process, but MUCH softer than other straightening procedure @ a salon. If you're willing to invest around $250+ (depending on experience of stylist & region you live in), this is a great investment. I don't have to worry about frizzies in the Honolulu heat & can wash & go w/ease.
Call around to get inquire about how much experience the stylist has. If s/he specializes in that, great. However, if s/he's been doing it < 2 years, ask for credentials. My stylist has been doing it for about 5+ years & she's really good @ it. Otherwise, move on to another stylist.
Good luck!