I just read all three pages of this thread! Yow!
I have been using my first e-cig 901 for about 2 weeks now. Yes, definitely YES these stupid e-cigs are a hassle at first. Charging batteries, cartridges, blah, blah, blah. BUT after a few days of being determined to sort this out, I got the hang of it.
Battery life? Who cares! I made a wall power plug so I can vape all day! Nic juice? I bought a bunch so I don't run out. Atomizers? I bought extra too!
Any newbies, please listen. If you want to leave the analogs somewhere out in the garage (like I did) and make an e-cig work for you, get lots of EXTRA STUFF!! Extra batteries, cartridges, atomizers, etc. And I mean LOTS! It's kinda like checking to see how many analogs you have in the pack before driving to work or to the store. Make sure you have ALL the stuff!!
But I will say, all of the instructions and advice about how many "puffs" or "drags" you will get off a loaded e-cig? A CROCK!! I don't get anywhere near the "puffs" advertised. Maybe I would if I didn't actually "puff" so hard on it!

I go through juice FAST! I get all my smoking habit satisfied but the stuff goes FAST! Get LOTS OF IT! Get backups of everything. Sure enough, the mail is late, the order didn't ship, the battery dies and a myriad of other problems crop up. Just have extras!
And as a sideline point: A little confession of stupidity on my part as a "just got it" e-cig owner. When I got my e-cig it came with carts to be used for filling. So there was no juice in them, just the puffy stuff. Hey, I didn't know. I popped one on and proceeded to vape, for 2 seconds. It of course ran out! Duh!

I'm much smarter than that now. I vape all day without a hitch!
Stick with it and PLAN AHEAD! Get a process that works for you and only THEN go and experiment with other stuff. According to what I have read here, the 901 or the penstyle are the best for beginners.
Oh....and I'm NOT a supplier.