(1) On fast forward, the time-left banner gets ahead of the displayed position. If you slow from 300X to 60X you will jump back on the banner by several minutes and the display moves too. To get to the end and check for show completion, I use 300X and drop to 60X when it gets below 5 min or so and repeat for 60X to 15X, a much smaller jump. It is nice that you can rewind/skip back from overrunning the end on the internal but sorry not so on the EHD.
(2) The EHDs have trouble getting up to a true 300X.
(3) OTA recordings with problems (low signal and dropouts) cannot be run faster than 1X nor rewound without risking jumping to the start of the recording.
-Ken