As a plumber in Montreal for over 25 years I can tell you that by scoping the pipes, you will know what condition the pipes are in and avoid having a very costly surprise which could have easily been avoided.
The process is simple. Within approx. an hour, I run a high-level inspection camera through the pipe which not only records the inspection for you to keep, also has an audio explanation of the process recorded on the memory stick at the same time.
I would be happy to answer any questions from you at any time.