Well right now i got the KR808-d1 its not that bad for me right now i just need to get some juice.
FYI - for about $4 you can also get a 901-510 adapter at Totally Wicked. This will screw onto your KR808 D-1 and allow you to use most attys/carts/etc. for most 510's. The reason I say most is that although larger type, such as those used on a Tornado, Inferno, etc., will screw on and fit with these adapters - these larger ones are made in combo with a cone that is used to slip or screw over the holes on these larger battery housings and are part of the air-flow design. That said, they can still be used but not as effectively.
Anyway, this will allow you to play around with other carts/cartos to see what they are like. You won't be able to determine the total picture as each battery/atty/cart or carto combo affects the experience, but you can see what the others are like before you buy.
Re the KR808 cartos - note that this filler material can burn when too dry. You inhale that, so keep your carto moist. Also note that you are refilling something you had in your mouth and you can't wash these things so there is a question as to saliva bacteria getting in there.
I find the 510 filler-types a pain in the * to refill and think I waste too much juice. These, however, can be washed, dried and reused so there is going to be less of a bacteria issue.
I think the ultimate choice, without going into mods, are the ceramic carts, or the new clear carts, or the Tornado Tank cart. The Tornado Tank cart, however, is one of the larger/cone combos I mentioned above. So, with a $4 fitting you can try any of the ceramic or clear carts mentioned above and several places sell them. This way you are not buying a new charger and battery for a 510 now while you search for the type of cart you prefer refilling. Several sellers list the ohm readings for the clear carts so you can try different ones and see how that affects your pleasure. This might help you learn the differences but the actual battery to atty or carto combo is going to also affect it.
I can take my Inferno 650 pass through with a 510 atty and drip tip and the throat hit is much stronger than if I use my clear carto on it -both with the same juice. You might consider this pass through as your next purchase because when charged you can remove it from the PC cord, screw on the bottom cover and use it as a regular mobile PV.
At the very least, this $4 adapter will allow you to start learning a bit more before you go on to buy another kit.
I'm still trying to figure out this throat hit thing. I am still learning as I'm only 3 months into this. That said, I own KR8's 510's, Infernos, Tornados. My collection after 2 months is on TheEcigJournal front page - but I need to provide an updated photo as I have several more batteries and a few chargers to add. I know the vapor adjusts with the type of PG/VG combo as well as the voltage of the battery. I think throat hit varies with the atty as well as the brand of juice. I say juice because there are some that almost burn and I think (please someone correct me where I'm wrong), I think people associate this burn with TH. The heat of the TH comes from the atty ohm and how it works in combo with the battery voltage used.
While I said I would never spend that kind of money on a PV, I think the variable voltage type is in my future. As for the logo below - that amount saved is really several figures into the negative if you count money spent on Ecigs. I leave it there to amuse me.