I have mixed feelings about pod systems, but I started vaping back when Green Smoke came out (terrible vape, but the idea of a small portable smoke replacement was appealing). Since then I've done the whole thing, more and more powerful mods, better tank (those early tanks were pretty awful by comparison with today), RDA's, RBA's, etc. The thing is today I am completely content with my various mods (with preference for my DNA 250 based mod, or YiHi SX450J chipset), and almost completely satisfied with my tanks, and RDAs. Problem is...
I still find myself backsliding at times, a real ciggy, and this is where pod systems and salt nics fill a spot for me. Normally I avoid tobacco flavored juices, but for use in a pod it's the opposite. I found a tobacco flavored juice I enjoy, and the experience is very close to the real thing. A few puffs on the pod and my nicotine craving is satisfied quickly.
I still enjoy my sub-ohm tank/rda mod setups for flavor, and the experience, but have increasingly been switching to 0mg juices. I am in no rush to give this up, I enjoy it

I use the pod system with salt nic to get my nicotine fix, and the other for the relaxation, flavor, enjoyment aspect of vaping.