Haven't tried the smart carts, but I am
vaping the lucid carts as I write this. The only thing about the lucids is the hole is way to small, you can take a small flathead/slotted jewewler screwdriver and enlarge the hole a good bit. After this small mod they work pretty good. I also removed the polly and use fluval in mine, seems to wick better. They take some fiddling, but work really great once tweaked out. Sometimes you have to mess with the filler and snug it upto the hole, or they can leak.
Once messed with a bit, and running right, they work great. Another plus is the air passage is pretty long, and eliminates getting "juiced" alot better than standard carts. You might have to play around with the hole size a bit, to get it right. I use 80/20 pg vg mix mostly, so mine stay pretty consistent. If you run into any snags feel free to pm me. Forgot to mention they work on standard 510 attys.