I wouldn't be surprised if they use the exact same flint. I have over half a dozen Spark-Lites and find them to work well. Can't say anything about the SOL, never actually tried one. TAD makes a brass one that's also really nice. It doesn't really work any better but it's much more robust, plus you can change flints when they wear out. The only downsides are the price (about $28) and the fact that it's round, so it tends to want to twist in your grip.