Finished 2 playthroughs of Desperate Escape, once with jill and once with josh.
Will go for the professional run later when the achievements aren't glitched anymore.

Pretty awesome DLC though, higher production values and tons of enemies rushing you. It's also longer then LIN, it actually feels like a regular chapter of the game.
I do recommend playing it at veteran right away, it got pretty insane at some points.

Rebecca is really a great addition to mercenaries, in fact I think she might be the best one, Barry and Excella were pretty great, but Rebecca is just plain broken. Barry is still more fun to use though.

Overall RE5: Gold Edition packs some pretty sweet content, grab it if you haven't played RE5 yet, or just grab the DLC if you have.
Good stuff (want moar:x).