If you hire a window company, and one guy does 12-16 windows in a day... You got hosed. Believe me, I've installed about 600-700 windows in my short life and I have installed for some local companies. I see how they slam and run. No insulation where needed, generic aluminum wrapping, cheap caulking inside and out. For me, its level and plumb, proper shims, correct wrapping, accurate caulking with the best caulk. Floor covering and vacuum up as I go. Also, For all that, I bet I can beat the big guys pricing. Who do you think pays for the tv and radio advertising?? Quick doesn't mean better my friends.