Update 3/18:
Within a month of use the rubber nub that seals the spout came off completely. Unfortunately that's the weakest link on this otherwise good product. However, without that the entire bottle is unusable as the spout won't seal and the contents spray everywhere. Contacted the manufacturer and haven't received any reply. Changing the star rating to 2, as only one bottle is now usable and I have to be careful watching out for the nub.
Much better than I thought. Looks great, works really well. I tried the regular protein shakers with mesh ball, which is noisy. Even if you do tolerate the noise the powder also gets clumped inside that mesh. Tried personal blenders, rechargeable as well as plugged in version. Both are feeble with their motor power, less volume (mostly 20 oz or less) and tend to stop after a minute so that it doesn't burn down the motor. Having had those experiences, I bought this with a lot of skepticism. But the innovative mechanism here definitely surprised me. No clumps, takes less amount of shake as well. Perfectly blended protein shake and a nice size to go with it (bought 32 oz). If you're on the fence, definitely worth a shot
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