I've been using it for about 4 months now, and I'm very surprised at how much I love it. As I get older, my formerly oily hair and scalp has been getting drier and drier, and getting my roots colored once a month added to the problem. I'd been shampooing & conditioning every other day, but that just made the dryness worse. I tried co-washing every other day, shampooing once a week, but my hair never felt completely clean on the co-washing days.
Out of desperation, I decided to try Wen. Wow. It's like the best of both worlds for me. My hair feels clean and soft, it's shiny, my scalp isn't itchy anymore. I haven't had any problems with breakage. I even get lots of compliments on my hair.
I don't use nearly as much as they recommend, I think that's silly and designed to make you buy more of the stuff. I wet my hair and use just enough Wen to cover it all, add some water, lather a bit, then rinse it out. Then I use more Wen, this time enough that it's really saturated, and leave it on while I finish showering, and then rinse it out. You need to rinse very, very thoroughly, or it will leave it bit of a residue.
I use Wen every other day, and a good salon shampoo and conditioner for color treated hair once a week, with a leave in conditioner. This has worked amazingly well for me. It's like co-washing, but with a touch of cleanser.