Pros - great flavour and massive vapour clouds
Cons - uses more ejuice, batteries can run down quicker, mods and batteries can be expensive
Some great set ups available to go sub ohm but can be a bit pricey as you need a powerful mod to run sub ohm devices safely, even though your 30w Istick is capable of firing something like an Atlantis or subtank at 0.5ohm the battery life/ user time would be very short between charges and there may not be sufficient power to get the full experience, some people love it, some hate it so probably best to 'try before you buy' if you know anyone who has a sub ohm set, if your near to or able to get over to brum you're more than welcome to try out my sub ohm kit. There are lots of videos and reviews on YouTube which are helpful also