So I've had an O Pen Vape going on four months now and it is what introduced me to vaping.
I find that it works with viscous oils as well although they can't be too viscous or it can clog temporarily.
Usually it's best to use watered down PG oil, since that is what the cartridges are sold with, but I throw in Liquid Gold and have even tried Pure Gold on it and it works just fine. So did Organna Labs but one of their oils was the too thick to fully enjoy. I would smoke for a session and if I wanted to take more than say 6 hits I would have to wait for the wicks to saturate.
It can be from the consistency of water (although I've found it feeds too much if this is the case, to the consistency of a thick honey.
The oil that clogged up my cartridge just would not flow at all inside the container and would take forever before it moved. It was that thick/viscous. Just be sure to avoid oils that are super thick and you'll be okay sneak and toking on this.
The website from the manufacturer is:
http://www.openvape.com/
I have not purchased anything from their website. I got the pen from my local dispensary for 25 dollars and then bought prefilled cartridges for 25 dollars to try out. Once I had a small collection of cartridges I started to branch out and try different oils as I found the world of vaping.
The only two downsides I've found are that the cartridges have a small fill hole and it will require a needle or small enough squeeze tube. Pure Gold fits perfectly in the hole and so do Liquid Gold needles. The other downside is that it produces small-medium clouds of vapor.
I haven't done any comparison to any other vape but just know that this one produces smaller clouds. It's not a cloud that is disappointing, but you won't be feeling much throat hit. Which in this case fits perfectly for stealth hitting.
The biggest pro of this pen is it's size. Here's a picture of mine in my hand for comparison.
It's so tiny I've taken hits just about anywhere after wandering around. I was in a Wal Mart snuck a hit. I was in the Hospital. Snuck a hit. I wasn't around people but the risk of someone coming around the corner was always there.
Point is it's the stealthiest son of a gun I've ever seen and never fails to deliver.
It is a simple no button operation that turns on when you suck and it's a bit of a tight draw but that also varies from cartridge to cartridge depending on how used it is.
I've had cartridges that flow really well after lots of use that still don't leak or gurgle.
All-in-all I really recommend this pen for your sneak and toke needs. Nothing is as stealthy or inconspicuous as a simple pen in your mouth. The smoke will be a dead giveaway if they keep staring, but if they just glance at you I've found it doesn't even register. Be it in hand or mouth.
So they're pretty cheap and won't convince you to ditch your heavily modded my-god-this-is-large-and-bulky 300 dollar wax pen but give them a try. You might like the high.
I've found it to be enjoyable and good for medicating. Sometimes stronger than smoking sometimes not. Depending on what you're filling on.Nowhere near where a dab is though.
So let me know what you think, especially if you've tried it out. This thing made my smoking life very portable.