I've enjoyed the KR808D-1 cartos on an adaptor.
I get them prefilled from
www.vapesafe.com (great juices/flavors...good prices). I figure by going this route I'm either getting 5-10ml of free juice, or buying the juice and getting free carts.
The main reason I like these is because they are really inexpensive (some store somewhere will always have a deal on them), can be had full of fine juices for the price of blanks, and best of all...you can pack at least 1.5ml and sometimes up to 2ml of juice in some of them.
So far I've never gotten one so bad that I could not use it at least once, but I do have to admit that some work FAR better than others. Stronger flavors do better in these (more puffs before flavor starts getting weak) than the smooth soft ones.
When filling my own...
I pack in the juice with a syringe...do the sling method, top off, blow it out, wipe real good, prime it up on a passthru, cap it, and drop it in an egg tray in the fridge with the battery end down. They each hold close to 2ml this way.
I'll do about 10 - 15 of them at a time...a new egg hole for each flavor.
They'll last me a good week or more before having to refill another batch.
Most of these KR cartos will last for several refills....tho' I pick out my favorite performers and only refill those.
They have a nice easy warm draw and are farily consistent from carto to carto. Adaptors can also be found with 'adjustable air flow' if you really want to tune up the perfect draw from carto to carto.
I'm also really loving the R5 Clearomizer XL that I just got so far. It might be a bit fragile for slinging around in pockets and purses...but it is a very nice vaping experience for me so far.