I just wanted to chime in on the efficiency of this thing...
I loaded my Omi with just under a gram of home made BHO on Monday afternoon.
I then proceeded to use it monday night, Tuesday morning, afternoon, and night, Wednesday night, Thursday night, and friday night (and I hit it hard on Friday)
And I've only used just over 0.2g of oil...
Very nice
Here's my circular breathing hitting technique:
Do one 7 second hit (until the battery protection kicks in), Sherlock style filling my mouth with vapor,
Inhale that, hold for 10 seconds, start a 2nd hit, pulling Sherlock style, and exhale 1/2 of the original hit through my nose while still finishing the 2nd hit Sherlock style.
One the battery protection kicks in again, rinse & repeat.