Pros
1. Leak-proof. Creative lid mechanism keeps drips contained in lid (as opposed to traditional shaker flip top like Ice Shaker, My Protein, etc. with occasional stray drips)
2. Solid Materials, feels premium. (Much better build quality than Ice Shaker on Shark Tank)
3. Good insulation, will keep liquids cold at least 3 hrs in my exp. (never tested longer, but noticed my drinks were still cold after my workout and shower. Note: I keep hydrated so will finish drinks by then anyway.)

Cons (minor concerns)
1. Silicon plug on cap became slightly separable upon forcing. (Note: did NOT interfere with function or user exp. may have been due to hard bristled wash brush and aggressive washing)
2. Silicone gasket began to discolour. (Ubiquitous in any container gaskets in my exp. from Thermos, to Lock Lock style containers)
3. Bottle a slightly tall and narrow for hand washing, no concern if you have a wash brush.

~~Overall~~
If you can go premium, this is the best option on market. Build quality and insulation is great. Design is hands down most unique and aesthetic. Who knew a small company would make my favourite shaker. ...Go green! Eco friendly for BBT or coffee (>^_^)>
Caution: wash specifically the silicone lip on cap gently- no hard bristled brushes for such sites- rest of the stainless or hard plastic is fine ofc.

Sometimes I hear myself talking about how much I love this drink bottle and have to stop myself to realise that the majority of the population probably thinks I'm a little bit nuts but seriously when it comes to cups this things is the bees knees! Super tight locking mechanism, haven't had any spills in my bag. Remarkably easy to clean. Looks great! It's awesome when a company can do something simple so damn well and these guys have left no stone unturned.

Only comment would be around customer service - my feeling is (as with most small startups/kickstarter projects) there's a VERY small team behind this product who are probably overwhelmed with enquiries. A sent some enquiries that weren't answered until much later and even the USPS delivery was a bit odd when mailing to Australia (kept getting updates like "your package has arrived at a facility in LA on March the 2nd and will be delivered on February 27th - ;D) but it arrived in the end!

All in all I was so happy with the product that I'm not really bothered by the above!

Well done.

I was looking for a great bottle, that would hold up in my daily living. The cap is nice and secure and gives me confidence that it will not spill when tipped over. I know I’ll be ordering another one in a different color.

I love the HIIT bottle!
It stays hot or cold for longer than claimed and it looks amazing!! The bottle is nice to hold and the attached loop is very convenient! Easy to clean and use! Twist top works perfect and doesn’t allow any leaking. I want another one!

My HIIT V3 comes everywhere with me. It is awesome for hot and cold drinks. I use it mostly for protein shakes, water and coffee and it keeps their correct temperature for about 24hours.
There is clearly a lot of thought behind the design and it is really well engineered.
Definitely worth the price!

I have thrown out all of my other bottles - I use my HIIT Bottle for everything