My very first e-cig (a little over five months ago) was the KR808D-1 (Vapor King is one of its brand names). I got it for its simplicity and it is that. The throat hit is good, the vapor is acceptable, and the flavor is strong (but it has an undertaste I don't like). But the cartomizers were getting pretty expensive ... and I've had only mixed success in refilling them. I still use it occasionally, but it never excited me.
After two weeks, I got the DSE801 penstyle: Wow! Pretty much everything I wanted in an e-cig: great vapor, throat hit, and flavor (and no undertaste). After a bit, my wife treated me to the Prodigy (still with the 801 atty). Even more intense experience ... often too intense, since I like to vape a lot. And it is kind of clunky to use outside the home.
About three weeks ago, I was restless and in the mood to try something smaller than the penstyle, so I finally broke down and got the 510 ... and I don't regret it. The 510 experience is very different from the penstyle (and not only because of size). It is smooth. Excellent vapor (perhaps a bit more than the 801, but not as thick). The flavor and especially throat hit are milder than the 801 ... and quite often that is just what I want (remember, I like to vape...a lot). The manual switch (and the button that engages it) works like a charm - much better than the manual 801 and KR808D-1 batteries I've tried. Overall, the 510 has been delivering my most reliable vaping experience.
I knew going into it, that the 510's puffs per battery charge were less than either the KR808D-1 or penstyle. The regular 510 battery is 150 mAh; the regular KR808D-1 (and 801) battery is 280 mAh. But the 510 recharges much more quickly than those bigger batteries. I've had no problem getting through a day at work starting with two fully charged batteries (but I alternate with the 801, so perhaps you should cut that in half). The obvious solution (the PCC) is due to arrive in Monday's mail. I expect that to make me self-sufficient for an entire day and evening (charging the PCC while I sleep).
So, for me, the 510 is tie with the 801 (each has strengths the other doesn't) and I prefer each of them over the KR808D-1 (although, with GreenCig carts, that can be quite good, e.g., much more vapor and smoother flavor).
IM(not so H)O
