They will screw up in every which way, one hand doesn't know what the other is doing, and apparently not only do they not train/screen their employees to be nice to housewives at home, apparently when confronted with the behavior of their easily-violent workmen, the company will instinctively take their side before you can even present your side of the story.
STAY AWAY! If for no reason then they are lazy and you will not get your service-contract's money's worth! Or better yet because of their threatening staff members. Be careful having your wife home alone with these people!