So, I've been using the Billet Bridge for some time now, and am finding it overall much nicer than cartos. But I must point out that the Billet Box itself is so wonderful, that I'd happily go back to cartos if need be just to keep using the Billet Box~!
Anyhow, I am now on head number 4. I do not build, or rebuild heads (coils), so am using stock heads. What I have found is the following:
The first 6-10ml on the new head is heaven.
Then the next 15-25ml on the head is decent.
After that I am getting a slightly burnt taste regardless of the voltage set.
Unlike cartos, the draw does not get harder (which to me is a win). I do not get any juice/condensation/whatever in my mouth like I do with older cartos. And, while the cost per head is higher than the cost per carto, I am not swapping them out as often.
I believe the hassle of the Billet Bridge being in multiple parts is off-set by the fact that I need not 'prime' it like a new carto - making the overall cleanup/change far easier than with a carto.
While not a 'cloud-chaser', I do notice that the Billet Bridge does put out more clouds than a carto in my book.
Of course, I am signed up for the Sabot-DDD and am curious to see how it stacks up compared to the Billet Bridge.
As a side note:
Now that I have had and lived with my Billet Box for some time now, I have found it to be my *only* mod I use. My ProVari (which is great) is simply a backup device now. I have traveled with the Billet Box carrying nothing but a couple extra cartos, juice, and batteries. I honestly see no reason to carry a backup device with me. A very far cry from when I first started vaping, and felt the need to carry multiple backups when just going away from the house for a few hours. Now, if going somewhere for a few hours, all I do is check to see if I should add juice, and swap out for fresh batteries - I take nothing else with me
Speaking strictly as a person vaping instead of smoking, the Billet Box honestly has made vaping on the go as painless as possible.