Bests & Worsts Reviews from Amazon

There are pros and cons to this system. A major pro over other systems is it uses a standard 20oz CO2 bottle like the type you get from a paintball shop, and is refillable without modifications or adapters. That difference alone is why I never bothered with soda stream when it came out. Now there are adapters so it isn't as huge of a difference, but it simplifies everything in a pretty major way and remains a solid selling point in my view. The major con (and I'm surprised it hasn't lead to a safety recall) is the cap design. It is absolute crap and the engineer that thought this was a good idea is a moron. The cap design is NOT designed for pressurized contents, and if there is ANY agitation or pressure build up, the cap WILL come off explosively when opened or if the bottle is dropped. The issue (should you care to understand cap design 101) is the number of turns to open and the lack of thread venting. Get a soda bottle and you can see the issue. A standard soda bottle requires approximately 1 full turn to open. The seal is disengaged after about the first 1/4 turn. The threads on both the cap and the bottle neck have gaps that allow pressure to release with the cap still retained. It also allows the pressure to be release in a controlled manner. The Primo bottle requires about 1/16th of a turn to open allowing full separation of the cap without any prior pressure release. The cap also does not have pressure relief gaps. If you fill the bottle with ice cold water, carbonate the water, then add ice cold syrup, then close the cap and allow the bottle to reach room temperature, and even without shaking the bottle you open the cap, the cap WILL blow off with enough energy to cause an injury if your hand isn't covering the top of the cap, and about half the contents will be on the floor in any case. It is also the case with this bottle that if a pressurized bottle is dropped, the cap will usually blow off. THIS BOTTLE WAS NEVER DESIGNED FOR PRESSURIZED CONTENTS. If Primo had an engineer with so much as two brain cells to rub together and allowed said engineer to do their job, they would redesign the bottle with the same thread sizes to maintain compatibility but just add thread length to the neck and gaps in the cap. It isn't rocket science so I'm assuming they either don't have a competent engineer on board, or the company's management is so grossly negligent that they don't give a rat's whiskers that their cap design is a glaring product liability to their customers. So mixed feelings on this one. Update: I have had multiple bottles explode spontaneously on me. The cap blows off and sounds like an M80 and the contents fly everywhere. I'm using this until a replacement shows up, but I don't think this model is suitable for ever closing the lid on one of these bottles.