Diesel Power Chip or other tune boxes?

Hey guys, I know this probably isn't the forum to be asking on for this particular car, but unfortunately not many people know too much about diesel tuning on the ford forums and its a bit vague everywhere else.

I'm after a remap or one of those tuning boxes for my 2010 TDCI Focus, and a fair few of you boys here have them done to your diesel 4X4s, I'd like to know how you guys have gone with them and any reports?

They all seem to claim the earth, some just plug into the OBDII port and flash over a generic tune like "Code:RED chip tuning" for example where-as Diesel Power Chips has a modual which piggybacks off the ECU?

I'm also looking for a good knowledgeable diesel workshop here in Victoria, someone who really knows their stuff if i decide to have some work carried out.

Thanks much guys.