All this e-cig stuff is very confusing - even to someone like me who has been using the things for over 3 years. I am not your average "veteran." Most vapers (and I'm sorry, but that word is still very strange to me) usually graduate very quickly to higher voltage MODs. I am not one of them. I really don't know what the 1st generation KR 808s were, but I suspect I got one with an order a long time ago, before V4L was even a company. My supplier at the time just sent me a battery, a charger, and some prefilled cartomizers to try. They had no brand. But, when I tried them, they were so much more consistent than what I had been using - a penstyle with an atomizer and cartridge.
There were also cheap passthroughs for the penstyles and I used them all the time when they came out. They wouldn't last very long because they were, well, cheap! The cable wasn't very sturdy and the little wires inside probably just broke after too much handling. I didn't mind though, because they would last at least a couple months. I am fairly certain these were not 5 volts, but I plugged them into an iPod charger (they worked the same plugged into that thing as they did when plugged into my computer). I could be wrong - I am very electricity challenged.
Then I moved on to V4L and they had a very durable passthrough. The first one I had lasted 7 months. These were definitely a big improvement and I liked their higher resistance CoolCarts best on them. I didn't have much luck with their batteries though. Sometimes they would fire and sometimes not. So I kinda gave up on their batteries, but continued using their passthrough.
I needed a "wireless" e-cig for when I was out and about and used regular 510 batteries and regular 510 cartomizers for a while, but those batteries don't hold a charge for very long. Then I got a Riva kit (like the eGo). I was very happy with them, but I didn't want the eGo passthrough since it didn't seem to be as sturdy and it had an inline battery. So I settled on using Riva or eGo batteries with low resistance cartomizers (2.0 ohm) when I left the house, and V4L passthroughs and their CoolCarts when I was at home. I only need to have one passthrough plugged in at a time. I never cared much for pre-filled cartomizers, so I bought blank ones and filled them with e-liquids that I made myself or bought pre-made bottles of e-liquid from companies that sold them.
About 2 months ago, I tried the dual coil cartomizers and those things became my favorite, and I used them on my Riva/eGo batteries.
Then I began hearing about Bloog and since Leaford (whom I regard as an expert) was all gaga over them, I wanted to try them. When I went to their site, all I wanted to buy were some cartomizers, but I just couldn't justify the cost, especially with their shipping and handling charges. So I waited.
Volt came on the scene and I was convinced these were the same as Bloog and their pricing was a lot better. So I got a kit with a passthrough. Well, their 1st passthrough was 5 volts and their cartomizers, although good on their little stock batteries, were not so great on Volt's first passthrough. (When I used Volt's cartos on that thing, my throat really hurt and the higher voltage pretty much washed out all the flavor.) I talked to the owner of Smokeless image about this and was told they were aware of the problem and would be getting passthroughs that worked better with the cartos. I exchanged my 5-volt Volt passthrough for their new passthrough, which is supposed to be rated at 3.7 volts. It's not bad, but after using it for over a week now, I've decided it still hits too hard when used with their cartos. I don't think I will be ordering any more Volt stuff for a while. I'll wait to see if they adjust the resistance, or better yet, make more than just one resistance carto. I'd like to see a variety of about 4 levels of resistance in their cartos. Another way around this problem (for me personally) is for them to offer an even lower voltage passthrough. The owner of SmoklessImage told me they are working with the manufacturer on this, but it may not be possible. So, we'll see.
All this e-cig stuff is changing so fast now, it's very difficult to keep up. Shoot, when I first joined ECF, it wasn't nearly so big and I could skim through the forum and find answers very quickly. Most members' names I recognized. Now, with so much information, it's just mind-boggling.
Those dual coil cartos really spoiled me and I wanted that same taste. They also provide very good vapor and throat hit for me anyway. Taste, vapor, and throat hit are all important to me, but I don't really care if there are clouds and clouds of vapor and my throat gets "hit" - I just want to feel it and taste it and see some vaper - I really don't want it to hurt. The volt cartos are made a little differently and I do think their performance lasts longer than V4L's cartos. The KR 808 or 510 cartomizers are probably the best for a new vapor. They are easy. I still think dependable passthroughs should be available for both and provide a consistent, quality vape.
Now, finally I am getting a 3.7 volt MOD. And just today, I even found a supplier who makes 3.7 and 5 volt passthroughs. So I ordered a couple 3.7 volt passthroughs and more 1.5 ohm dual coil cartomizers. Hopefully this will keep me happy for a while. I also found some 1.5 dual coil 808 cartomizers, ordered a couple, and will see how those behave on my Volt 3.7-volt and my V4L 5-volt passthroughs.