I use it and timing for me isn't an issue I put it in when I first get in, I do the rest of the showering and just before I am ready to get out I rinse it out. I have hair that is just above the neck and I use 1-2 pumps for each the front, back and the sides. If you have longer hair then you would use more pumps. It is expensive but I get mine from QVC and they run specials on it periodically. We got the gallon jugs in June and previously we had the taller bottle about a quart of it and that lasted me 6 months. Based on what I would spend on Shampoo, Conditioner, and a leave in product for 6 months it was about even.
Not everyone will be a fan and if your not sure you will like it, try going to QVC's site they sometime have kits that have smaller bottles in it so you can try it for a bit before buying larger quantities.