Plumbing connections are industry standard, so it fit easily into a replacement position. 
This is the only disposer that comes with a power cord prewired in, so all I had to do was to plug the disposer into a switched outlet.  It's not that hardwiring is complicated, but it sure is inconvenient to do in a lower cabinet!
Best part is that I never knew that a disposer could run so quietly!  I've seen a lot of brands over the years, but this one is definitely the quietest!