Hey Janet no worries! Just remember it's all personal preferences and tastes -- but with the juices I've been using lately (halo and vapor station) I think the volt carto's just taste better not as "hot" -- for me they taste best on just a regular v4l battery, which runs 4-ish volts fresh off a charger compared to the 5volts on a passthrough. But after reading your question I loaded up a volt carto with a "delicate" (to me) juice --V4l white chocolate-- and tried it on the v4l passthrough. That was almost 1 1/2 hours ago and I haven't even had to top it off, and it tastes great! And I chain-vape LOL...the nice thing about these carto's to me is that they don't ever seem to get that funky burned taste that some carto's get...especially on the passthrough.
And I agree with you on the sturdiness of the v4l passthrough -- I use mine a lot, and also use volt carto's on an ego passthrough (with an adapter) when I want a little "cooler" vape. If you don't mind a 510 connection, the ego passthrough seems pretty tough, and it's nice to be able to just disconnect the usb plug and use it like a regular battery.
I don't want to totally hijack imagine's thread, so just pm me if you want to know where to get a good deal on a 510 passthrough -- or if my attempts to answer your questions don't make sense LOL