I've just received the new, temporary shaker bottle, and I love it! It's a million times better then the V3:
- The wider design really helps me with preparing the meal since it is way easier to aim the powder into the bottle. This may not seem like a huge issue, but more often than not I'm preparing my meal in a hurry and I've got the powder all over the place because of the V3's narrow design, the V4 is also easier to clean because of this.
- The V3 got chunks of powder stuck in the opener (the small removable part) which was annoying to wash, the V4 doesn't have that problem. The opener was also awkward to manage while drinking.
- The ice gate (or whatever it's called) mixes the powder a lot better, I've experienced no chunks at all with it. The V3's metal coil is a cool concept, but I still got chunks stuck to the wall's of the bottle (I'm really not sure how the ice gate manages to solve that, but it works). Also, in the V3 I sometimes got unmixed powder layer in the top of the bottle, no matter how long and hard I shake. This was solvable by not mixing all the powder at once, which was annoying and slow. The V4 has none of those problems. The big issue with the coil was also its loudness. When the content of the bottle reached the end, the last few sips were always really loud. It's also annoying to hear the bottle from the backpack whenever you make a step.
Btw, the bottle doesn't look exactly like the one in the picture, the hole isn't on the side as the picture suggest, but rather in the middle. Also, the colour is blue.
These are non-issues for me, I really don't care, I just pointed it out for the sake of accuracy.
In short, V4 is a success if you ask me and I really don't have anything more to ask for. When you'll be making the V5, I would certainly suggest to keep the wide opening, the ice great, and the screwable cap.
P.S. The V4 bottle that I got in my last order got a dent in it which leaked, but Kala from the customer service offered great refund options which settled the issue. I would just like to thank her for that here publicly.