My two-month progression:
BLU starter kit. Within a week my charging pack stopped working. I immediately visited a local tobacco store and was guided to a generic pen-type starter kit with a 650 mAh battery, two top coil tanks with non-replaceable coils, and wall/usb charger for $30 plus tax, and three bottles of flavored e-liquids (after taste testing in store). BLU replaced the charger pack after a week, and I rarely use it now except for travel convenience. I DO refill the BLU cartomizer with the juice of my choice (have well over 2500 vapes off the very first cartomizer with no bad taste or coil failure).
Grabbed a 1100 mAh battery and a couple bottom coil clearos which gave me a power backup and multi-tank flavor availability. Trying some new flavors I found that I preferred the bottom coil atomizers ... UNTIL I won a raffle for a new "ORBIT Vortex" kit with a 3 voltage position 900 mAh battery, larger TopCoil (3 ml) tank. The ability to adjust voltage seriously improved some flavors and tank configurations.
I hate the Orbit tank (and the battery's non-universal tank connector), so bought a true variable volt 900 mAh battery (adjusts throughout the 3.2 - 4.8 voltage range). At the same time, I copped a dual bottom coil Kanger Protank 3 Mini. I LOVE the ProTank 3 Mini with dual coils ... and the Gravity branded Variable Voltage battery flawlessly allows me to tailor any tank/juice combo to it's best.
Sooo ... now I guess I've grown into a hobbyist ... visiting ECF, YouTube and elsewhere for more and more info about this great new hobby. Even bought VG and flavors for mixing my own ... and at some point will likely move on to nicotine and PGliquidsalong with more flavoring options and mixing juices totally from scratch. BTW ... My BLU cartromizers filled with my own mixes are vastly superior in vape volume and taste and nicobuzz than the one flavor that I tried from them (Cherry Crush). It's now VERY impressive.
Best of all, I have ZERO interest in ever smoking tobacco ever again.