First off, I'd like to start by saying I really like your product. I absolutely LOVE the chocoloate taste in particular (which my recent order should also tell you ) and I plan on using this as a regular part of my day in the future.
Now with that said, I have been using your product for a little while now and like I said, I am generally very satisfied. Apart from my extremely stinky farts I thoroughly enjoy almost everything about it. That is everything except your bottles. I have not had the honor of trying the previous models, but the one you are using now is, to put it nicely, extremely frustrating in a few ways.
The large rubber ring/gasket/seal, whatever you call it, in the dark blue screw-on lid keeps falling out no matter how cautious I try to be when tightening and this makes preparing the shake take way longer than it needs to. I don't know how it's possible, but sometimes it even falls out while tightening and drops into the shake with the lid fully on. I guess that sounds like fun if you are into fishing for rubber gaskets, but that's not really my thing..
When this happens you don't always see or hear it fall out, and so when you start shaking the bottle sprays Queal all over the kitchen cause it's no longer tightened enough to contain the shake. And as if that wasn't enough the rubber ring, after having been shaked with the metal ball, has now entangled itself in the ball and you have an unwanted puzzle on your hands trying to get them untangled.
Long story short / TL:DR: It's super *beeping annoying!
The "hole" in the lightblue cap is suuuper annoying. It seems to hold an infinite amount of powder in it which makes me HAVE to check it after shaking cause I don't want a powdery 1'st taste when I drink my shake (also, I'd like to have that powder in the mix where it belongs instead!). This, in conjunction with number 1, makes the whole shaking experience really tedious and like I said initially makes this take waaay too long.
Looking through your forum it seems like I'm not the only one that finds these 2 things annoying, so I really hope that you will try to remedy them in the near future!
-- Rant over