So far it was the only trade where I saw a tip line. A nice lady in their office called me after to ask how the install went, and if the installers cleaned up well. I told her all was good, but I would not use them again due to the tip line on the invoice. She tried to explain how giving a tip wasn't necessary, to which I explained that putting it on 1 of the screens on their ipad puts in my face and I don't want to have to decide to tip or not tip; especially on such a large transaction.