To each his own. I have no desire to drop a LS1 in my FD - I have no trouble keeping a rotary running fine. Mine has 160k on it and is a daily driver.
However, my 40k miles Mustang has left me stranded twice. You should have seen the faces of the guys when I told them that I needed a reliable engine in my car, so I was planning to put my extra 13B-RE in there.....