You cannot beat the sound of a real leslie, but they are so heavy. I used to play hammond in a band and used a leslie, but when it came to doing gigs the transportation was always an issue. When you will just be working on one location I guess it will not be so much of a pain.
These days there so many alternatives for that leslie sound, so you may not need the real thing.
I even played tapes with a taperecorder through it, and can remember listening to the intro of "Hotel California" by the Eagles and it really sounded big as the intro itself has some of that swirling sound, so the leslie made it even bigger.
Leslies and Hammonds went out of fashion in the 80s then we saw a revival in the 90s but at the moment you do not see many of them around.
Cheers,
Eddie