Let me start by saying the concentrate chamber is well made and definitely does the job its meant for. Now, I gave 3*s because there was absolutely nothing with it except for a few stickers for random companies and a paper telling me who the "picker" was. Not everyone who buys these products has used them or anything like it before. Instructions, a paper the size of a fortune cookie fortune with simple instructions would make more sense than nothing at all. Also, what is with the lines/cuts on the product? It makes it appear like there are multiple compartments to unscrew when it's really just the 1 at the bottom which wouldn't matter had there been instructions to specify if it was something to unscrew and clean or w/e. I have a Uni Pro and its a stuggle to get the magnetic ring attachment to connect to the chamber. As in I have to press the 2 items together as hard as I can as I turn one of them to get the adapter to thread so it can be used. If I don't do that, it appears the adapter is too big and the threads don't grab hold. I absolutely would recommend the product so far although I've only had it a couple days. Just if you're new to consuming concentrates in this manner, be prepared to be a little lost at first.