Well, have done some more research. Have to say I'm not keen on the 3 piece design, seems like too much can go wrong, as well as a lot of messy work with refills etc. What drew me to GS was how simple it was with the 2 piece thing. KR808D-1 seems similar, can't understand why they aren't interchangeable though, aren't they the same thread pattern on the battery?
Hiya! I'm new to this too, but I can tell you if you smoked a lot, you will likely continue to do so with your ecig - at least this is my experience.
I went for Green Smoke prior to finding this forum and I regret it. Like you, I thought that the 2 piece design would be a lot easier and less mess. My main issue is that the batteries are total crap - flavors were OK, not great, OK. If you were a heavy smoker like myself then you do not want one of these. It will leave you desperate and irritated.
I used GS and straight smokes for a month together due to the battery issue. Then I wised up and went for the standard 3 piece 510. The three piece design is not bad to deal with and the 510 certainly produces more "smoke" than my GS ever could hope to do. Once you get going with it, it all becomes second nature.
The batteries are still crap on the 510 but you could purchase a 5 pack for 1/5 the cost of the GS starter kit and rotate them - that's what I have been doing for the last 3 weeks. OR...and again, I was and am a HEAVY smoker...you could cut straight to one of the larger battery mods, such as the Chuck or Silver Bullet, which will give you happy smoking no dead battery vaping all day long...AND ITS STILL CHEAPER THAN A GS STARTER KIT. (Ordered my Silver Bullet last week and can't wait for it to get here!!!)
One more advantage to using the 3 piece and then I will get off my soap box... With the 3 piece you can try the many different flavors out there and always have a FULL cart with a short 10 second top off. Its a few more items to carry, but then again, with GS, I had to lug extra batteries and charges around with me!
Vape 'em if ya got 'em!