I've had my Nutribullet for six days now, and I've made at least that many smoothies. My concoctions keep getting better and better, and I've learned a lot! The Nutribullet itself is very convenient to use and to clean. I love the simple design and sleek surface: no buttons, etc. Just press the top and either lock it to stay on, or pulse it yourself. It's very powerful. I've tossed in frozen fruits, apples, oats, seeds, nuts, spinach, and milk. It's had no problem at all. The flax or chia seeds don't really get blended unless you do it for a few minutes though. Mostly they just stick to the sides. Two small criticisms: the large plastic glasses (it came with four) do not nestle into each other, making storing pretty bulky. Also, it came with a handle cup lid, a sealed lid, and a "drink" lid. I wish it came with a lid for a straw, because I always take my smoothies to go, and I hate tipping up the whole thing and hoping it's not going to leak on me.