Anyone have experience with the all-in-one shower units?

[Karen Cook]

I am rehabbing a flooded home.  I would love to slide in one of those all in one shower units:

1. I heard that it is difficult to pull out existing plumbing/tank

2. Possible problems with leaking at the connection on plumbing.

I have seen them in new construction and really like them.  Thinking it would be a quick and easy solution, but maybe not.

Karen in Houston