if the guy did the job and your delighted with it and you agreed the price before he started.. then whats the problem ..job is done, money is paid, your happy, why should you care that tom, dick, and harry, down the road are saying you were ripped off,who else could you have got to do it...move on, put it behind you, and just be happy, he did not do a half ass job,and charge you 3 grand, and you then had to pay 3 more to get it fixed, quality comes at a price.
+1 that would be my angle on it too.