Currently I am using the 901(3.7v) with 808 cartos, 3.0 ohm, I think, and also use the KR808D1 with same cartos. The 808 I find, gives a more consistant satisfying vape than the 901. I have ordered a Mega LR 808 carto from Nhaler to try on the 901. I haven't recieved the GLV Mini yet, but curious as to what differences I might expect with the GLV using the same cartos?