I bought one of these years ago, and didn't do much good. Well I have Lupus, RA and stuff and don't have a lot to invest, this was like 20 bucks and I am still smiling. I drink the Boost nutrition drinks. Have 4 big things of the nutrition powder. I ordered the Bullet and just returned it, cause how big is this thing in a box as big as my recliner. My son gave me his blender. I'm sick and tired and can't be bothered with the mess, then the real mess. My hands are arthritic and I was shaking that drink mixer with the magical spring. My hubby, God Love Him was gonna show me the right way to shake the cup, but he forgot to tight up the lid!!! Anyone wanna paint. NOW, we are gonna talk real. This is one awesome mixer, I think you can mix concrete with. Please, I kidding, OK? Got me. Well made, price is a Blessing. And the clean-up. Put half your liquid with your powder in you plastic cup. Stick it in add the rest of your liquid, half a clean plastic with a smidgen of dish soup zzzzuuupppp, dump and clean water zzzzzuuuup it again. Done Don't think about it, this is the one! 9, 29, or 69 years old,milkshakes, protein drinks, Boost, or milkshakes for everyone May God Bless You All