OMG!! I was just coming to post something similar!!!!
It worries me that those sellers selling the "sample" bottles are compensating are taking product out of the big bottles then compensation the "lost" product with water, then sell both.
The first Purchased I made was a 34oz bottle of QOD from seller BrazilianKeratin. Since I have never seen this product before, it was all good.
I was satisfied with my first seller, BrazilianKeratin, because the product delivered what it promised, shipping was fast, even tho the product spilled a bit in the box, I was still happy. I got my HUGE bottle and The product worked!!
But when I was ready to make my second purchase I noticed how the ratings dropped badly from my first seller (BrazilianKeratin), from 99.9% to 97.5%. Yes he dropped the price to $135 (compare to the $179.00 the bottle is being sold at), then saw a review of someone claiming the product was diluted. (oh oh)...gave me a weird feeling about this...I hope greed did not take over. He is selling plenty of sample bottles, hope he is not taking a couple of ounces from the big bottles to sell them in sample size and replacing that liquid in the big bottles with water to sell them also. Makes me think now why it spilled when I ordered from him.
Greed make people do crazy things(he has been selling these bottles like hot cakes, you know?)
So I went to a Top Seller with great reviews keratintoday
...my bottle was factory sealed. NOTHING leaked from the bottle.
On my first order with that other seller a bit spilled in the box (huummm), this time NOTHING spilled.
I also received from this seller (KeratinToday) a letter of official distributors.
The shipping was fast!
Having making a purchase from BOTH sellers I will have to agree with HairGuru...BrazilianKeratin's QOD was more watery. Now I suspect why!
But so far my hair can't tell the difference. Maybe water does not change the effects? ( I hope is water what it's use to dilute) Lets see if this application last a lot longer also. I will keep you posted.