Gin, yes, I've used them over the years. Not so much lately, but I've put them
thru kwite a bit of vliquid, for sure.
I'm not sure if these are bridgeless, but my guess is that they do have the bridge. You can easily remove it if you prefer them without.
Have you used any 510 attIEs before? I think the Joye's work pretty darn well. Voltage? Welp, these are LRs (1.5Ω) so I'd do what I always do, which is to start low and adjust to taste.
The eternal mystery of the vaper: "How long do they last?" They last exactly as long as they last.
@classwife would be a great voice of reason here, as I believe she's had a ton more experience with 510s than most.