I used the Ninja Sizzle Smokeless Indoor Grill and Griddle and found it not smokeless at all even though I used the appropriate oil as per the instructions. It smoked but not enough to set off my smoke detector 
I used this product in place of a grill, found I had to use lower heat than recommended as the meat was drying out even though it was marinated lamb (which doesn’t dry out it in the oven.) 
If you follow the product’s instructions it’s a fail however if you know how to cook, you can modify and get the perfect results. 
Cleanup was super easy on the removable grill. 
Great product but again, if you just follow the product instructions it would fail.