i own a small electrical business,3 employees,and do mainly residential and light commercial,one builder that we have worked for since 92 and have probably wired 80 houses for started using another electrician because he was $3000 cheaper on the same size home we were doing,well after he done 2 houses they started calling me again. turns out his work was sloppy,he could not make any of the 3 way switches work,he would not come back for minor things and it took him a week to rough in a 4000 sf house,and longer to finish it out.long story short you get what you pay for,i never found out but I highly doubt that he was $3000 cheaper. they have never said anything about price since,and we even went to the 2 houses he wired and fixed all the 3 way switches and some other minor things for Free,just for laughs.now every time we see him at the supply house we have a good laugh about the 3 ways