Yes, I do use Passage lists heavily. I love the merge lists function. I wish I had more control over the merge/dup drop that occurs on a sort. I love that it is not restricted to Bibles. But there are still improvements that could be made especially on the mobile apps:
You will get emails for comments I just made.
It is worth mentioning that PL's can be used as cross references and milestones e.g.
crossref:passageList:"Test Passage List"
milestone:passageList:"Test Passage List"
thanks Dave