They're removable, but it takes a bit more effort than with IBM Model Ms. I use a modified set of large tweezers as a keycap puller, which seems to work well.
What I did was use a pair of needlenose pliers to bend the tips of the tweezers inward about a mm or so, which allows me to slide it around the bottom sides of each individual keycap, grasp it, and pull upward with minimal potential for damage. It works far better than prying them off with a flathead screwdriver, which I do not recommend.