PDC isn't really all that great for inching in since it gets to a solid tone (or red on screen) when you actually still have some space left. If you really want to inch, the camera is where it's at... assuming there's enough lighting.

I have driven an SUV for 14 years now and it didn't have a camera of course... now that I do have one, I realize how much safer (in terms of scratching your bumper) it is. I gung-ho'd many parallel parking jobs before. Blind faith, literally...

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr