Depends on how close one is to the props......... You stand next to em and tell me.......The C-130s were not uncomfortable but they were loud inside, I figure the C-17s are much better at comfort and noise level.
How quiet are they on the outside Ringel?
My first flight in a C-130 was 10 hours, I sat next to the right inboard engine without ear protection, when I arrived at my destination I couldn't hear for about an hour after. Never made that mistake again........
They're also a bit "bouncy" in flight, got air sick the first time, never got air sick after that. On one trip we had some senior officers with us, it was fun watching them turn green at the gills......