I've used a number of them.
They run a little cooler, higher ohm reading, and work best for me with fruit flavors.
They cannot be dry-burned for cleaning as they pop real easy.
I'd guess the number of duds, ones that just never
vape right, is about 25-35% higher than what I experience from Joyes. (This is a guess as I've had more dud Joyes than SLB's, but I use Joye more often.)
I have not had any luck with them and dark colored juices. They seem to clog and get hard to draw with the dark juices I've used in mine.
YMMV as my data set is rather limited.