I wouldn't want to take that big mower on and off multiple times a year. I wouldn't mind swapping it back and forth in the spring and fall. I have a spot in my lean to that is wide enough to fit my tractor plus all my motorcycles/dirtbikes, riding mower, etc. If I put a 59" mower on it, I won't be able to fit everything in there. With the 42" it'll fit under the tractor and I can keep everything the same as it is now.
I already have a riding mower that I've been using for 7 years. I'm just really looking for a way to use the Cub more. I figured I could use the 42" mower deck to cut the back property every other week or so and give my riding mower a little break here and there.