EXCELLENT PROGRAM...JUST A LITTLE BIT TRICKY TO LEARN.
After buying a Macbook Pro with an unusual keyboard layout I used Ukulele to completely remap several keys. You NEED to read the manual carefully before you attempt to use the program. There are three steps you need to do to create and INSTALL a new keyboard layout and you must reinstall a new layout if modify it again.
Most importantly, you can't alter a layout if it's active in fact doing so can screw up your system (or so the manual warns) so you'll want to have at least two layouts installed and set your keyboard preferences so you have a convenient pulldown menu that allows you to instantly switch between layouts.
It sounds a little complicated and it is (a little) but once you learn the procedure it's EASY and WORKS GREAT.