It was very professionally done. Of cos they did the triming and cutting. They added some anti -slip strips below the mats so that they dont slide around. I opted for the premium mats which were thicker and also has a thicker support for the heels of your shoes so that it doesnt dig into the mat. The full set cost me about $175 for my 335 coupe. They can also cut out a huge piece for your boot but will have to pay extra $30-$45 for that i think. You can see the pics that Chris has posted. They are exactly like that. And they even gave a 1 year warranty for the basic mats and a longer warranty for the premium mats.
Cant believe that people go into such details even for mats!