Nothing wrong at all with mag blocks. You can make lots of fires with one, and they are relatively inexpensive and foolproof. They do require two hands to work, and they aren't fully waterproof. But hey, they are good kit, and one of several options.

I have a magnesium rod with a ferrocerium striker anchored to it glued into a piece of antler with a leather thong and a piece of hacksaw blade in one of my kits. This is in addition to a couple lighters and a Couglans firemaker tinder kit.

The only thing I would like to add is a good piece of willow, some ash dowel, and a cedar fireboard.