I'm still pretty new to vaping, but here's my $.02. I have Volt autos and a Bloog manual and love them both. The manual is great for the CE2 clearomizers (juice gets into the airway more often than I'd like, so I prefer using them on the sealed manual). Bloog and Volt cartos are both pretty good, but I think Bloog is using a different juice, perhaps a touch more VG in the mix. Volt's pre-filled cartos are 80% PG and have pretty awesome TH at 24mg. I got my Bloog pre-filleds in 18mg and different flavors, so it's hard to compare, but I find them just as good (although I'm not a big fan of the Watermelon).
I've also gotten a lot of extra cartos and stuff from goodprophets.com (who are having a sale at this very moment). Shipping is average, prices are excellent. Anything for the DSE901, from what I understand, has the same threading as the KR808-D1. I haven't seen attys anywhere that are labeled as 808, but there are tons of 901s out there. GP (and other places) also have adapters for different styles. I just ordered a 501 atty with an adapter myself; I'll let you know how it works.
I've also gotten a lot of extra cartos and stuff from goodprophets.com (who are having a sale at this very moment). Shipping is average, prices are excellent. Anything for the DSE901, from what I understand, has the same threading as the KR808-D1. I haven't seen attys anywhere that are labeled as 808, but there are tons of 901s out there. GP (and other places) also have adapters for different styles. I just ordered a 501 atty with an adapter myself; I'll let you know how it works.