This winder has it all. Durable construction, the biggest tuning keys fit in the winder, you can cut strings up to .135, no issues to do roundwound, flatwound or nylon. The string puller is something I use less (I prefer to pull them by hand), but might be handy with thinner gauges. Very easy to wrap your hand around, and it turns and cuts very smoothly. a must have in your gigbag/case