I Forgot to mention, I purchased mine from Vapor Junction (I got some regular sized and some that are XL), awesome service, fast delivery also. Satisfied customer totally 
I just ordered some as well. I couldn't resist that 30% off Womanofheart mentioned. I've not used these before so I was wondering if they need to be cleaned out when you first get them. I've read somewhere that they do. If so, what is the proper cleaning procedure?
Oooh, I have some blunt tip needles that I use to refill my inkjet cartidges... I think they will work. Off to clean the ink out of them!
I've not come across any lately that were filled with primer, better safe then sorry though flushem out and do a quick dry burn.
I've had nothing but bad luck with these cartomizers. I got 2 packs of E-2 R4 2.5 ohm. All 5 that I have tried worked fine for about 15 minutes then gave me a horrible burnt taste. I've tried them on every 3.7 device I have as well as my riva, ego, inferno and my old school 901. I just can't get one to work. I wish they would work because I love the concept of them. Now they only way they work is if I drip in them every 5 minutes.
Can you do a dry burn with a 510 manual battery? Right now I only have auto batteries and I don't want to suck on them dry... I don't think I would like the vaporI ordered a 510 manual battery out of curiousity anyway.
The 2.5ohm CE2 V4 on a 3.7V bat seems to wick slow (gives that burnt taste), however 3.0 ohm on 3.7V bat wicks fine (great for when you can't drip - i.e. driving). Refilling with a blunt syringe is a breeze. On the 1st fill, be sure to remove the silicon from the blunt needle as it makes the hole wider on the 1st poke and removes a small cross section of silicon.