I've been using the conditioner and hair mask for about a year and a half now. I primarily rely on it for hair color, which from my experience with depositing conditioners and conditioning dyes, it's the most potent combination of vivid color and conditioning I've experienced. I have tested A LOT of dye in my day and this is my and my peers' favorite. People will mistake my hair for "freshly dyed" when its been over a month and I'm just washing and conditioning my hair (and I go for bright color) A little goes a long way unlike some other dyes I've experienced, and the mask in particular is quite hydrating (the instructions may say leave on 10-15 minutes - I find it more effective to let it go for an hour or more)
Harder for me to speak on the shampoo as I'm no longer a shampoo user, but I will wash once a month or so with it and it doesn't seem overly drying.
Feedback
The completely post-consumer use packaging is very much appreciated, although I always wish companies that prioritize that had a mechanism to ship the packaging back. I've occasionally had issues with the autoship (I move between shades a bit and their systems can grab incorrect colors) but customer service is easy and attentive and this can be resolved quickly.