I have a Roamio Plus (with upgraded 3 TB drive) and I just pulled a bunch of movies I had recorded off the Roamio to my PC using kmttg. My transfer speeds ranged from 45 Mbps to as high as 83 Mbps for each recording. My Tivo is on wired ethernet with 2 gigabit switches between the Tivo and a relatively new Airport Extreme gigabit router.
Are these speeds typical? Should I have been getting faster transfer speeds? I figured with the gigabit ethernet that the plus is capable of I would have averaged over 100 Mbps on at least one of the downloads.