I purchased the unit Jan 2018 after a colleague treated me to what I refer to as his Ninja mix, consisting of several vegetables sweetened with orange, grapes and juice. I laughed at it for about 2 weeks before trying it and finding the veggie mix tasted far better than I could have imagined, not to mention it would be a considerable change toward eating healthier. I finally got around to using my high output blender after letting it sit for 8 months. I used the medium sized cup which worked fine except for a moment requiring me to fit the pitcher on the base, in order to reset the flashing red power light. I used the pulse feature. The next day my teen wanted to make a smoothie. We set everything up for the second use of this brand new blender and it powered up with a red button and would not operate. I tried fitting the other new container options and none of them were successful at restoring normalcy to the base. All containers were fitted properly. Finally in frustration, I lifted the base off the table a few inches and dropped it back down (not knowing that this was a documented action to take in some instances) and still no response. In frustration, I grabbed the base as if to press the counter release buttons on the bottom, but instead placed my thumbs on the top console buttons and proceeded to press and drag my thumbs down across several buttons at once and suddenly part way through this tantrum, the blender fired up with the empty pitcher in place. I was astonished and froze in place, until I remembered the containers should not be run empty. I shut it down, setup my mix and so far it has worked as intended with one exception, the power button remains solid red start to finish.
The "ninja people" have made a note on my account of the current status in case it relapses while under warranty. I understand that when they decide to "treat" a condition with one of these units, they provide a shipping label and the customer pays ~$20 for return shipping which translates into the customer having paid shipping to and from the company for repair of their "shouldn't be broken in the first place" product. Despite my misfortune, if it works, it's a good piece of equipment to have, if it works that is. If mine gives out after the warranty is up, I'll fix it with a better product from a different and more reputable company. I'd still recommend it although reluctantly given how problematic this issue is for many customers if you perform a google search as it looks like some image cleanup work has been performed since just before i made my purchase. The only reviews that matter are the negative reviews as they yield the truth about what problems you may encounter with the product.
I read about problems like this with the ninja, but believed the company had worked the trouble spots out. WRONG!