I love my XMG's but have never fished a SI. With them advertising them as 40% stronger I had it in my head it would fish less fast and be less rigid than the XMG line. Interesting. Sounds to me like the line ratings may be a bit low? Rogue Rods have some super fast actions and the slightly older models have line ratings you don't see as commonly. I have a 9' 10-20 Rogue that is a killer heavy fish drift rod. Isn't the lightest rod in the world and has heavier guides. Littl e off topic but kind of relates. It seems the staff all prefer the XMG line over SI for drift applications as well, from what I've heard. Different materials.