I played around a bit more with it last night, and I am less impressed than initially. The flavour is poor, at least I think it is - to me it tastes burnt, and even with a brand new coil and trying to keep the temp low by heating only for short puffs, I still could not avoid the burnt flavour. Given that the heat is applied by a fine tungsten wire, perhaps this design can't avoid overheating the rosin. It is possible that the rosin I was playing with is poor, I'll reserve judgement until I try a couple other strains.