I've got an 8 (caravela), 19, and a 24, all with 18350's. The 19 misfires occasionally but, it doesn't bother me that much. The 24 with the side button is a little longer, but it's easier to fire and feels better in hand. The 8 is the smallest, the bottom switch fires every time.
I prefer all of them over the K100, the switch is awful.
I know the high end guys would say these are all junk, but we all had to start somewhere, and these are entry
mods. The Segelei's at around $30 are a good value.