Ikenvape does all he can to improve on attys and cartos in the areas that count.. especially the choice of resistances and hopefully durability.
Not sure how he does it or who does it for him, but there is something about the DSE from China that makes the 901 nice; light, clean, and lots of vapor. They just don't last in my experience. Over the last couple of months I've gone through more than a dozen.
When one dies, i just slap on another, but it's starting to become obvious that they don't hold up.
Most vapers, it seems don't bother much with 901's for some reason.
I liked the old LR's on my 3.7 pv's; 1.8 Ohm...
Iken's version at 2.0 is pretty good... it seems to get a bit hard to draw though. I can't handle his 801's ; heavy draw and big and bulky.
If the Fusions are a 510, with a 801 connector, they should be just that; a 510 carto... i would guess it's got something different in the design, or i'd just get the 510. (since i have to use an adapter to get it on)....
I got some Gold 510 v2 coming so i can compare.