I usually call KR808D-1 KR8 to avoid confusion (the forum make that a definition link). If I am talking about an adapter I use "808" because that is what KR808D-1 is usually called in adapters like 808 to 510 etc.
The SmokelessImage, Bloogplanet and I think Halocig G6 uses the same cartos - very nice cartos - bottom coil, very absorbent stuffing, less likely to leak, easier to get a good drag out of - very nice. Cooler on the lips than Vapor4Life WOW cartos (the WOW cartos got me to use a plastic or delrin drip tip as a mouthpiece - these cartos can get hot on the lip end, but well worth trying sample packs there, I think especially the WOW Tobacco SHop pack that contains WOWBoy.
I use only thin clear juices, PG w/ 20% or less VG. plus a couple of Vapor4Lie WOW juices and I still need to try some SmokelessImage sample packs (their juices are 80PG/20VG) and I avoid all dark and cloudy juices or any other juice that drops flavoring sediment in the cartomizers.
I use only manual batteries (harder to damage or kill with juice leaks, easier to get a good hit). On a manual you can use a standard resistance DSE901 atomizer and drip tip (both available at LiteCigUSA.net) to test juice samples. I never dirty a carto to try a juice. Drip tips are not recommend on auto batteries but you could use 901 cartridges.
I've been using KR8 and 510 (manuals) for 11 months and KR8 is the most powerful slim ecig you can buy - 3.7v (3.6 for the rubberized models like SI, Bloog, G6 which is how they get their 40mah of additional charge). And their popular cartomizers like the two I mentioned above are 2.5/2,6 ohms right at the low end of standard resistance (lowest you should go on slim batteries). I started on the short KR8 batteries and then switched to the standard/78mm ones for the longer charge. I also now own some 3.7v mods and a 3.7v Riva 510 kits from Liberty-Flights.com (the Riva 510's there are 3.7v ones) and I use a 510 to 808 adapter to use the KR8 cartos on those (as well as using 510 stuff on them).