I had 4 sliding door repair companies come over to give estimates to replace the rollers on one large 10 foot sliding door. Their representative gave me a price that seemed extraordinarily high to me, he was my first estimate. Everyone who came was quoting prices for stainless steel heavy duty rollers, the door is very heavy. Three out of four vendors had samples of the rollers, they all looked the same, high quality, weighty. When I asked how the job could cost so much,I was was told that the rollers cost $250 each which left another $600 for labor for what I was told was an hours work!! Two other well rated vendors came in with prices less than half of what these guys wanted. For all I know they do great work but there are lots of sliding door repair companies out there, I’d recommend shopping around. Regards. Ned.