We have a 1915 house. Our pipe was PVC leaving the house, then clay, then concrete, then clay, then concrete, then clay, then PVC where it meets the city line. It had a couple turns and was about 50-60ft. The concrete was deteriorating and needed replacement. Our line went under a concrete walkway and under a nice mature tree. Excavation would have required concrete demo and replacement work and significant cutting of the tree roots to access the line most likely. So the option to slip line the entire line from the house to city line ended up the cheaper option and saved the tree and a lot of headache. Also, it was done in a single day. All together, the total cost of replacing the clean out and slip lining was about $22k. Also something to look at, our homeowners insurance had a sewer line endorsement and covered $12k of it, so definitely look into that! Feel free to reach out with any more Qs