I've always liked D'Addario strings when used on electric guitar and so I decided to try their XL ProSteels on my E9 pedal steel. I've been knocked out with how good they are. They provide a very rich and detailed tone, especially on the low-end strings. For the high-end strings, they are very smooth and clear also which can often be a problem when finding a good set of pedal steel strings. What I really like about them, is that they are very durable and long-lasting. I haven't changed a set on my pedal steel in about 6 months but there has been no real obvious degrade in quality of tone.