I buy my boge LR XL's from electronicstix.com Good price and fast shipping. I used to buy smoktechs for use in my smoktanks but shortly after buying smoktanks and the orioginal cartos they changed the filler design of the smoktech and they went to serious crap. They wouldnt wick thick vg like bobas nor would they handle thin high pg count liquid as they would flood and moved to boges and use pbusardos howto on slotting cartos.
I tank all my cartos ,I enjoy the boge vapor, It seems to hit alot less harsh than the DC's and always wicks properly. HOWEVER. i cannot get a carto to last for much more than 30mls. Either the carto begins flooding from wear out or the draw gets too tight. I am not completely satisfied with either carto but atleast boge cartos are much more useful. FYI I only use 100%vg or 50/50 mix. I personally believe the whole dual coil thing is a bit overrated. I would settle for a carto that worked over a multiple coil that was worthless.