I called TKS because my patio door was hard to open and this vendor had good reviews. When I spoke to Troy he said the problem was most likely the rollers and the repair would cost between $70-$100.
What should have taken less than an hour took about 2 hours.
He arrived and first looked and sprayed the bottom of the door into the roller area. When this didn't work he took the door off and tried to clean the rollers. When he put the door back it was even harder to open and so he took pliers and tried to widen the side tracks thinking that the fit was too tight. This too didn't work. He tried other things but nothing worked and after about an hour he left to go buy rollers (for some reason he didn't bring any with him). He had to travel to 3 different stores, one of which was at the other side of town, to get what he needed.
After 2 hours the new rollers were put on and the door was fixed. I paid $122.62 and not the $70 - $100 I was quoted. I am disappointed that I had to pay for his 40 minute trip searching for the rollers.