yeah, you can get blends with nicotine in them and order up to 3 months supply at a time - forget how much it equals altogether. you can also get blends without nicotine. i've got two big bottles, one of the PG, one of the VG, plus a few 50/50 bottles mixed up for convenience when i want to make a quick blend without having to grab out the syringes, etc and measure everything up.
there's a whole culture behind the scene. there's some really elaborate smoking pieces as well as your simple pieces. the dual core atomizer seems to be the go at the moment, a lot nicer than the first basic one i bought; it's got a nice mouth piece on it as well which makes it that much more enjoyable.
as for smoking it in a plane, well, my friend got away with it on an international flight coming back from Japan. i've smoked through shopping centres, inside hospitals, etc and not got so much more than a weird look here and there. no one has really said anything - whether they know what it is or not or because they're not game to speak up. they don't leave much of smell, if at all.
they've been a nice substitute for me at least. especially being on the nod and not having to consistently roll and light up

all i need to worry about it the battery dying or the mixture running out.
pm me if you want me to send you to a few decent links of australian suppliers.