I also thought the road test of the BM and the Merc was good, the camera work was brilliant. All in all, a great episode.
Can't fault the post work, though Autocar TV's pastiche of it was bang on.
I'm surprised the Merc dropped the M5 that easily, AFAIK both put out 507bhp (Though the M5 is often quoted as 500 (though the actual output's probably being lost in a blur of PS equations