I've finished the job, for the most part, just need to cut off some stubs and put the angle valves on and then the Master bath will be back to normal. Need to run some new pipe over to the new bath fixture in the guest bath, but all of the new valves are in (ended up using the Stop and Waste Valves all around).
New question: How likely is it for leaks to develop over time? And will they develop quickly or over a long time?
When I turned everything on, everything is looking good,
no leaks (right now). I just dont' know for sure how much to trust my solders not to leak down the road.