I've used 510 atty's and carto's on several 510
threaded
devices. I've also used 901 atty's on them with an adapter and 808 carto's too. I've used standard resistance and LR's of each also. Quite frankly I can't tell a difference in performance between 901 atty's and 510's. I also can't tell a difference in performance between the 808 or 510 carto's. But between atty's and carto's, atty's win in my book. They produce more flavor, TH, and flavor in my opinion. Especially if you're using LR's. I guess I'm just not a cartomizer lover. I only use LR carto's and only if I'm where it's inconvenient to drip on my LR atty.
By the way jangofett, you can use KR808 carto's on a 901 battery without an adapter, they're the same
threading so there's no need to use a 901-510 adapter, just order some 808's next time.