Disposables sell because they're simple. If a customer has to figure out airflow rings or button sequences, you've lost them. Look for devices that are draw-activated and require zero instruction. It sounds basic, but you'd be surprised how many devices complicate the experience. In the LINQ series, the LINQ-ONE is about as straightforward as it gets. For customers who want a bit more control, the LINQ-PRO offers adjustments without overwhelming. The rule: if you can't explain it in one sentence, it's not easy enough.