The hardest part for me (6 weeks and going strong) is finding the right juice. I've already discovered i don't like the cheap Chinese Juice available here in Thailand, so have to order 30ml juices from US vendors for 10 times the price. Some are great, other's not so, but we don't have access to the test packs so end up with loads of pricey juice we may not like. I've spent loads more on juice than i have on vaping gear, even though i currently have 2 unitanks, an Aspire BCD, an iclear16 and an iclear30B. I also have two vision Spinners and an ego vv3, and in many ways i prefer the simplicity of the former, though it's nice to be able to plug the latter into the laptop. The latest clearo, the Iclear30B is the champ so far, but they're all ok. Make sure you buy extra coils, as my 30B came with a duff coil (fortunately i bought a spare when i ordered it.)
I've not had a single rollie since i started, even though i initially bought the ecig to cut down, but if i fell off the wagon a bit o wouldn't beat myself up about it.
Good luck. D