Depending on what you want it for, it can be great. The big advantage for me has been the ease of cleaning afterwards (our normal blender requires significant dismantling). I guess the cheaper copies have this advantage too.
What I can’t vouch for in the cheaper versions is the nutribullet’s ability to destroy almost anything you put in it. Really good for making smoothies with veg and seeds in them. I use mine mostly for post-ride milkshake and it obliterates the nuts I add in seconds. Mine’s 18 months in and still in almost daily use.
EDIT – also, some of the stuff up there about nutrition is maybe misleading, but putting loads of sugary fruit in your smoothies is probably not that healthy. Veg is good though.