I'm in the same boat (although I have already swapped brands due to pooling our resources & giving all my eRoll parts to the Mrs)
Thanks.
Lessifer, I think its the function of the automatic battery that is most important to me.
6steel..., I have not tried the USA joyetech store (didnt realize they had a US store). I still believe the E-Roll will be gone soon so still interested in other options if they exist.
You'll note they are out of batteries (as is the UK store) & they aren't in production any more, although the atties are still being produced as they are used in a number of Joyetech products. The other half still has 2 unused batteries, but will soon be joining me in going over to.....
2) If you do not mind cartos, I highly recommend the Epuffer Magnum snaps with the PCC. I carry it with me all the time. Most of the flavors don't do it for me, but their menthol flavor is good out of the box... also, pop the top off and fill it with your own juice. I re-fill mine with White Walker by Seduce in 18mg max VG, and use them regularly. Cartos last forever if you fill before they burn. The batteries are Tiny and the weight is such that I can dangle from my mouth while driving. The carto+battery is about the size of a regular ciggy. Also, the magnetic attachment is super handy.
They produce a fraction less vapour than the eRoll (although not so as you'd notice without doing a side by side comparison. The battery life is about the same (possibly a smidge less, but again not as you'd notice) although this doesn't really matter as the PCC has a good charge & lasts a day of moderate to heavy vaping. The biggest difference for me is the size, they are about 1 - 1.5mm or so thicker than the eRoll, at first they felt big, but I got used to it.
I do miss having a tank, but the good news is that they (or certainly their UK store does, I've not looked at the US site) do 5 packs of blank refillable carts, which are a lot less hassle than vaping the cart dry & refilling. Also the bung at the end is rubber on the blanks as opposed to plastic on the pre-filled, which makes it a lot easier to remove / replace. Worth noting too is that the blanks are soft-tip as rather than rigid, making them feel a lot more like a tobacco cigarette when in your mouth.
As mentioned above, the cartos seem to last an eternity if you're careful with filling them & the magnetic system makes changing carts a doddle! I was a little worried about how well the magnets would hold, but I needn't have. It's a solid connection, you could drum with them & the carts won't fly off the batteries.
Over all, I'd recommend them as a replacement for your eRoll (although I am constantly on the lookout for a cig sized tank system available in the UK (Curse you Kamry) ) I tend to use mine when out & about or when I'm working (I have ePuffer 629 e-pipes for when I'm at home) & never had any issues.