I chose the heartfelt beads. Reviews of the other beads led me to believe they have cracking and splitting issues. It didn't change their performance, but I didn't want to chance any of that residue escaping my stocking bag and getting in my humi. From what I've read on here, it seemed like the KL was alot of trial and error to get it set at the percentage you desired. That could also be fun, but being mostly a novice, I liked the fact that the beads were "pre-set" and have had no worries since then.