I have tried the 1.5's but they are a coiled element and I really do not like them. I much rather prefer the LR 2.0 or 1.8 Boge verticle element cartos. They give a consitent draw and last a long time. Plus I just love the hiss and pop they make when you draw on them.
I purchase mine at Nhaler:
NEW 510 Mega Low Resistance Cartomizers
and the 1.8's at ProVape:
510 LR Cartomizer for Electronic Cigaratte.
I am sure there are other suppliers and I am just letting you know what I like and where I get them. Happy
vaping