It was my first vape and I must say - do NOT buy this one. I think Iolite is much better choise.
I've simply bought it only because of price. I know, it was stupid decision.
Pros:
-It actually works (gets high + visible vapors)
-Digital temperature controll
-Comfy in hand and not hot at any touchable place while working
-It's portable
-Price
Cons:
-Awful plastic taste and smell (burn in of the unit just lowers it to 10%, and it's getting back).
-which means I don't think it's healthy.
-NOT RELIABLE - everything breaks itself easily.
-Can't vape everywhere.
-Battery is recharging about 9 hours and lasts for about 3 bowls (Small bowls, high for 2 people).
-Herb chamber too small (It's almost impossible to get 3 people high).
Comparation to Iolite:
Oxygen cons:
-PLASTIC taste and smell (maybe also health issues)!
-Electricity powered (not as much portable as Iolite and more accessories, adapter makes it less comfortable)
-It's much bigger (It's hard to put the Oxygen with adapter to the pocket).
-Made in China ->
-VERY LOW RELIABILITY (I have mine for 1/2 year and about 6 parts are broken)!
-Slower and less efficient.
-Smaller herb chamber
Iolite cons:
-Hot mouthpiece.
-Not as comfy in hand (just the shape at hottness at the vent place) - but more comfy because of no adapter.
-No temperature controll (this can be actually good, I was iritated setting the temperature on the Oxygen everytime).
-Price (not a big difference)
My Iolite and Crapir Oxygen:
http://img442.imageshack.us/img442/8081/img6249l.jpg