That's mirrors my experience. I ride outside so rarely we can call it 'never.' Only for races, or when I'm somewhere where I can train on a mountain. I watch tons of TV shows that I download to my computer and I listen with ear buds which helps modulate the volume. I do lots of structure, and like the ride feel of the emotion rollers. I've been doing this so long that the difference between my inside and outside numbers is very small. I've mulled zwift, but I find that the small inner voice cries out in stress over the learning curve or riding technique, tech, etc. What I do works for me, and my potential tech issues are really only related to my SRM or powercontroller crapping out.