I was just on the site myself, as I dug up 2 in my stash after shelving them for a while... I like their narrow profile, and take a 510/901 d/t, and at 2.5 Ohm, they hit nice!
I have been using a Provari exclusively, dripping, and now that Dual Coil cartos are all the rage, thought i'd recheck the Fusions on the Vari... so far liking it at 3.6 v, and want to try going up just to see.
If this works out, I'll be ordering a few more, as my Vari makes short work of DSE 901 attys, my favorite atty, 2.8 Ohms at 4.2v....