OK, I looked so I better post something. I have used ce2's fo a few months now and really liked the taste and vapor as compared to filler carts. Just got some G4's last week. Performance wise they are pretty similar to the ce2's but they are way easier to fill especially if you use a syringe. The exterior housing on the G4 is way sturdier thean the ce2's. I always do replace the ce2 housing with a piece of BD 3ml syringe, but definately no worries with the thick housing on the g4's. I'm liking the g4's for decent vaping and convient filling. The big rubber mouthpiece will pop off if you aren't careful, but seems to hold better if you shove it in a bit further than it's designed to go (so a few of the ribs sit inside the housing). Sorry, haven't tried the vortex so I cant give any feed back on that choice, let me know what you think if you go that route. Happy vaping.
-MrKipp