TwooDeff is right about the carts, I haven't used my Omi since three weeks after I first opened it.
The Omicron is crap (well, the cartridges are always shotty). To anyone out there interested in getting one for whatever reason, don't do it, it's a waste of money. Get a bubbler and quartz nail for the same price as the V2. It clogs, it burns, it barely hits, and it gives a nasty sorethroat, many who have one will say the same thing. Advice: Carry couple paper clips to unclog the thing, throw em away or wrap em up, don't throw them in your pocket with oil on them
I thought it would at least be "stealth" but it's really not worth it when your leaking honey oil in your pockets lol.
The Omicron looks cool as hell though, it's the cartridges that have made it near impossible to work with.