I suppose what you think of this episode will depend largely on how recently you've watched the series to this point. For myself, that means I've rated it poorly, since I had digitally recorded the episodes and recently re-watched them to catch up. If you've just come from watching the series recently, like I have, then there's absolutely NO new information here, with the exception of a handful of voice-over lines from Robert Hawkins, which add nothing to the series whatsoever.
This is completely a clips episode. It's utterly boring, unless you've forgotten what came before, and should be skipped over by anybody who remembers even the basic plot of the series.