I quit smoking in 1 week using the 801 and I will *always* be partial to it. (I had been smoking since the 60's!

) Especially when I switched to EM's attys and it got even better. Absolutely positively the best 801 attys around, bar none! I have yet to push the little button into the hole using EM 801 bats - which is an easy thing to do with the "other" attys that has those irritating recessed buttons.
I also quit smoking with the 801 atty from EastMall, it took me a whopping 4 days to quit completely.
I could not believe it. I will always love East Mall,
and the EM 801 for this.
I too have not found a better 801 atty, they are renowned as the best 801 around, and yes, I agree, the buttons are more robust.
Then I got the 401/EM4 which is OK but a little wimpy unless you dip. Advantage is you can hold the auto like an analog but I found I prefer the manual bats so you can "preheat" the atty.
I have had and tried the EM4 - (401)
I must admit, I liked it very much, and I had no probs with the cart on these, I just squirted a bit in the cart and off it went, lovely amount of vapor too.
A very nice, fine and delicate one, suitable for a night out for sure.
Then came the KR808D-1 and the DPV9. These are my 2nd favorites.
OH yes, now you are talking ------
this is -- absolutely - DA BOMB
This is the best mobile, and walk around ecig going----
it is also the very best for anyone starting out,
so easy, -- no mess, - no fuss, - just screw on the carty and vape for 3 hours, -- change carty-- and off you go again-
the very best beginning to learn to vape ecig - and the only one I recommend for beginners.
Somehow I never got into the 510 and the 901 because of the smaller carts used. You get kinda spoiled with size of the 801 carts. I fit 30 drops into a new blank cart!

But still curious about 510/901 but undecided as to "should I try them?" I have soooo much stuff now I've an entire file drawer jammed full to the brim. 8-o
I never really got into the 510 a nd or 901 --
hahahaha -- for the same reasons - the carts were too small for me,
I had been spoiled by the massive juice capacity of the 801 and could not bear to be dripping into these tiny lil things every 5 minutes.
As you rightly say, with the 801 we have a juice barrel, it takes a full 30 drops and just vapes for ever before needs refilling, I get a good 70 - 80 puffs with mine on a full cart, this is my bliss.
Lastly, my Indulgence.

Aw, a thing of beauty it is! I love the dang thing! Vaping at 3.7 w/o an extended cup I can go 12-14 hours on ONE bat! Now that's impressive. A question about the 801 HV atttys... Are these not recommended for 3.7 vaping and should I just continue using my reg. EM 801 attys? I find the PT especially will turn the liquid "dark" after a while (heat from 5v?) but I've been washing the filler out as you suggested and that works like a charm.