I bought a 3m kit on eBay for my '08 4.8i for $100. Took
e about 2-3 hours to do it And had to reorder the hood piece be aide I messed it up. First time I have ever applied the material. I would say it is a 6/10. But way cheaper than paying a installer. However for my wife's '10 3.5d I decided to pay the dealer to I stall it so it is perfect.

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2013 Cayenne GTS Basalt Black/Alcantara (Wife's Daily Driver)
2013 Porsche 911 cab Aqua over pebble and agate (My daily driver)
2010 Porsche GT3RS Black Grey/Black Alcantara (Track car)
2012 Porsche CaymanR Peridot Green with carbon sport buckets (Wife's Track car)