Only the best for me This is a good company I have had problems with my vape pen they have a lot of questions because maybe they can help you fix it before you have to send it back or they just want to make sure that it's broken whatever the reason after you answer the few questions they will send you a new one I've had to do it twice now but I bought two pens because they're amazing and I love them just have a little patience with these people and trust me everything will work out just fine this is a good company their products are amazing I smoke over a gram a day and this pen holds up perfectly for me the flip one

I had a complaint about the pens coming… I had a complaint about the pens coming broken …. They sent me 4 new pens within 3 days ! I appreciate the fast service and that my concerns were actually listen too ! Thanks May ! So happy with this company !

Good service but the product was… Good service but the product was subpar. Of the the 2 batteries I bought one stopped functioning a month into light use and the second is on its last leg after heavy use in the same amount of time. The first one the battery says it’s charging but then won’t fire and the second needs to be held the correct way for function.

stopped working after 45 days. stopped working after 45 days. After reading other reviews, I will not be asking for an replacement, I've already thrown it in the trash. Just a waist of your hard earned dollars.

Trustworthy source for high quality vape hardware. Very pleased with the quality of product this company produces. You can just tell the product people are quite deliberate about the engineering and aesthetic choices that go into the production and sale of their hardware. There are so many companies producing this kind of hardware that DO NOT care about the quality or safety of their products - I purchased from several of them before I found O2 - and there is a world of difference here. Some examples of why I think they make GOOD STUFF: - Tasty carts. Everything I vape through their cartridges (both full-ceramic and non) tastes like... the thing I'm vaping through it, and nothing else! No metallic taste, no "dry hit" taste. Of course this depends on the thing vaped through it, and O2 can't control that, but what they can control for, they do. - Reusable carts. You get what you pay for. I have refilled my O2 carts several times before they start to get "stale." I have experience re-using carts from other brands like Delta Ape, and CBD is Better. No knock on those folks, they make fine disposables, IMO. But this product is superior for the environment relative to those, and in the long run, is actually cheaper per use, because you get more uses out of it. Of course this also depends on your usage habits and what you vape through them, so YMMV. - Well constructed carts. You can just tell by looking at and touching the carts that they are well-constructed. The silicon seals are of good quality. The glass is ground so as not to have any sharp edges. The carb on the airflow-adjustable carts actually works well. All of these things indicate attention to detail, and good design to me. - Stylish, discreet, and reliable, variable voltage batteries (I got two Nano's and two Lil' Bitty's). The "user interface" on these is as simple as it needs to be, and no simpler. They're efficient, no-nonsense devices compatible with a wide range of carts. AND, they're serviceable (of course you need to know what you're doing regarding circuits and batteries).