Soft maple isn't soft. It's just not quite as hard as hard maple. Definitely suitable for a cutting board.
Here is a soft maple cutting board I made for my wife, I face glued soft maple (curly). It has gotten lots of use and has held up well. WJ
Kevin , you can use about any wood on a cutting board using the end grain. It just wears and wears, but like stated already there realy isnt anything soft about soft maple. It will get the job done, I doubt you will ever wear it out. BTW, Im still looking for you to show up at the shop one day, R.K.