I just got the blender and it looks pretty nice... I made a smoothie and it turned out pretty good. The second time I made a smoothie I notice a mild rubber burning smell... thought maybe I did not put the blender on the base correctly... third time I made a smoothie I  Notice my smoothie had weird plastic like pieces in, but I thought maybe it’s pulp or the whey, so I went over saw black stuff underneath and behind my Blender... now I’m thinking was sipping plastic pieces from this blender... I haven’t made another smoothie, I have to figure out what is going on... and I notice the same black stuff is behind my blender and I have used it... 
but other then that I thought I had a good blender.