Hubby and I bought this set when we were first married in 2012. 
This set has NEVER failed us. 
Even when I used it as a food processor (do not recommend), and it began to smoke, I left it alone for 30 min and once it cooled off, it started right back up again! 
I do wish that it had an option, like the Vitamix, where it came with a pestal to manually move the product inside, down.