Absolutely love this glass cooling body, personally I feel it provides the best experience when using a Dynavap cap.
It gives a cool, clean & crisp flavour, with no contaminates compared to using a steel or wood body.
It has a carb hole so you can control the amount of air to vapour ratio as well as heat.
It is my go-to Dynavap accessory and use nothing else when at home.
There are a few downsides however.
1. The long version doesn't fit in a Dynavap stash case.
2. My friends say is looks like a crack pipe, so not good when out in public!
3. I have bought roughly ten of these due to being glass and me being a clumsy idiot, they break really easy, especially when you fall asleep on the sofa in front of the TV and it falls out of your hand onto a wooden laminate floor!
Of course, no.3 is par for the course when using anything glass for vaping, especially when dropped onto a hard surface with a hunk of metal shoved in the end. It is amazing the amount of shards of glass it can create when dropped, so it is not recommended while out and about, unless you are super diligent and carry a dust pan and brush with you.
Vapefiend customer service is top notch as expected, and they have even replaced one I was bought for my birthday by my wife, that was broken on arrival without any fuss.
I highly recommend Vapefiend and this glass cooling body, just bear in mind it's glass and it's fragile, so be prepared to have to replace it occasionally, unless you are always super careful and treat it with the respect it deserves!