I use frozen fruit to make my smoothies and it has no problem incorporate the fruit into the other additives. I have also chopped nuts and other vegetables with no problems .
I've had a Smoothie daily in my new NutriBullet 900 since I received it about a month ago. While I waited for its arrival and before I received it, I made my smoothie in my Baby Bullet! This NutriBullet 900 is so easy to use (push and turn to left) with great results: delicious fruit/nut smoothies. You get more than your daily requirement of nutrients from healthy ingredients of your choice! And what a boost to my energy and health I've noticed! This machine is powerful and came with many cups/tops/handles. Am so happy with this purchase!!!!!
Two things make the NutriBullet Pro hard fro my wife to use. First is the force it takes to ensure a non-leaking assembly of the cup to the blade. Second is the pressure it takes to push the cup assembly onto the motor assembly. Maybe these items can be looked into. (No, I can't always be there to assemble it to make it work without hitches!).
I have had my Bullet for a month & have used it several times. It is the only way I will eat fruits so this working fine for me. I will be trying vegetable soon. I have problems getting the blades off after processing it.