Good thread, some good tips and advice.
Just thought I would throw in my

. This is from my experience, regarding the 510 and the eGo, both of which I use every day. I have the joye 510 with the PCC, and an eGo passthrough, the one with the battery, you can unplug and
vape. I use the smoktech 1.5 dual coil cartos, on both, and for almost a month have had no problems, both vape great and are still kicking. Most of the time I have 18mg
tobacco in the 510, and use it when I have a craving, and the eGo is my main vape, with whatever flavor I have mixed that day. I've been DIY my juices since I started and it's not that hard, if I can, anyone can. I use Easy E-
juice calculator, so I am able to mix to whatever level nic I want, right now I'm down to 14mg for the most part. That's the easy part, hard part is getting the flavor to come out right LOL.
The 510 was my first real e-cig (I don't consider the gas station one real, but it did give me a chance to try it) and I am still using it, so I disagree that the 510 was not a good first choice. But everyone has their own tastes and preferences, IMO.