We had windows and siding put on our house by a company called Window World out of Davenport, IA.  They did a lot of extra work and did a good job in every respect.  But ours was not a straight forward job.  We had termite damage in one wall, around some windows and in a floor.  They replaced all that stuff and fixed everything to my satisfaction.  That was above the cost of the original estimate.  
When it came time to settle up I was a little concerned as to how much the extra was going to cost.  Well I was surprised at the amount but what surprised me more was what they did with part of the money.
$500 of the money was donated to St. Judes Childrens hospital.*  You need to know they were the lowest bidders on the job, did good work and were worth every cent they charged me.  So that $500 was real money not cream.
If I need more of that kind of work they are getting the job. 


* I know because I wrote a separate check out.