Overall, this is great stuff! I ordered extreme red deep treatment and conditioner. It is easy to use, smells good, and is non irritating. It will stain if you don't clean it up IMMEDIATELY, but I have yet to have it leave a permanent stain if I clean it up quickly with a Magic Eraser sponge. Even rinsing immediately helps. It will also stain your skin including your scalp, but usually the stains on my skin go away while I am rinsing, and the scalp stains are not too bad if I remember to rub my scalp a bit when rinsing. The scalp stains go away after your next wash, too.
My only small complaint is that this goes a little pink on my already color treated red hair. It looks true neutral red in the container but the results are a bit burgundy. But still beautiful. I may order some extreme orange to counter the cool tones and mix for my next time as I am really not looking for fantasy colored hair, just a vibrant "natural" red. This is bright, but still natural enough for my conservative job, and I have received numerous compliments. I would just prefer it to be slightly warmer colored.
For those looking to maintain a natural-ish red color--this is the best solution I have found to keep vibrant red in my hair so I don't have to color as often. It even blends my dark blonde/gray roots enough to look good. I will definitely purchase again.