I'm back to give feedback on my Wen experience thus far. I tried the Sweet Almond Mint variety. My hair type is very thick and a bit wavy. I normally pull it back in a ponytail because I've just gotten disgusted with it. Wen was a desperation purchase.
The process is pretty straightforward; I used 20 pumps on my shoulder-length hair. I will try using a few fewer next time (I felt like I put too much on the front of my hair), but overall it went ok. I really scrubbed my hair until my arms hurt and then rinsed for quite awhile. The last rinse was lukewarm, as directed.
Pros: My hair does look better, much better. You have to realize that I was starting from zero here, so my results are probably exaggerated. But my hair is very soft and shiny. I left it down today, which I doubt I've done for six months, and it didn't annoy me or get frizzy. My hair is much easier to manage as well. The smell of the shampoo, which was a strong mint, also faded completely once dry. I wouldn't have wanted it to stick around. I didn't find that the product made my hair look or feel dirty at all. 24 hours later, my hair still looks clean.
Cons (maybe): It does take a lot of time and product to get the results I got. I sort of wonder whether just investing the time and care into my hair with my old shampoo would have yielded reasonably good results too. The formula is not terribly moisturizing, so if you're looking for hydrating hair treatments, this may not be it. It's surprising that putting so much conditioner on your hair doesn't overhydrate, but I found that not to be the case. Finally, the directions on the bottle call for a lot of combing of hair, in the shower and out. My hair tended to get knotty and I'm sure I broke some strands trying to get the comb through in the shower. I definitely lost more hair down the drain than usual. But I have plenty to lose, so no big deal for me.
I'm going to stick with Wen for the time being. It's the first product I've found that I can use at home that really makes a difference in my hair.