Hi,I'm new to e-cig, many of my friends had switch smoking to vaping and i must admit that i've been seduced !I actually own an Ego type with DCT carto.Work pretty good but not the most discreet thing ( especially considering that my batteries are T-rex ) , wich is your favorite configuration for "on the go", I've seen those Sd keyring thats looks to work fine, and has an automatic battery, ( wich i like for driving ect... ) or the Ovale elips ( That is apparently a more durable e-cig but no automatic battery and pretty expensive ) ?Have anyone compared those two or anything in the same sizes ? 306a or cigarette's like don't seem very effective on vapour amount...Am i wrong ?I've read many posts on those but can't really find a comparison by someone who had both...ThanksPs : Sorry for my english, still learning !