Bests & Worsts Reviews from Amazon

We bought this item because we needed another set of cups and blades. However after a month of so of use, we started noticing there were leaks and on top of that brown stuff was coming out of the bottom of the blades. Please take a look at the pictures. This is very disappointing because this material is cheap. We have had the 600 for over 2 years and the material never had this issue. This brown residue at times was sipping through the blade up into the smoothies and juices, which before we noticed it this was getting into and we were drinking it. Once we noticed it, we would have to clean it thoroughly, but i must say, that i don't understand why this is a BEST SELLER when it already has this issue and many other customers are having the same issue. It concerns me as this is happening and don't know what or how many times this was in our juices. Also, notice that in pictures IMG_5057 and IMG_5058 the blade seems to move up and down a bit and it is through there that the brown stuff was sipping in.