It does have a 90 degree spine, but as you'll recall the knife has a heavy protective powdercoat, including on the spine. I'd expect to have to scrape through that coating before being able to strike sparks with it.

To me the 90 degree spine issue is kind of "meh". It's nice to strike a firesteel but most of the 'steels I carry have dedicated strikers (my favorite being the GobSpark Armageddon by Firesteel.com). Perhaps the bigger reason for that feature is to scrape wood to make very fine tinder. Great if you do it that way but that's not my usual technique.

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Some good deals!

I like Moras a lot;just about all the knife you will usually need. One I carry a lot is the Light my Fire Mora with integrated firesteel; I have used one as my primary ignition source for a canister stove quite a lot lately. With one of those and a Bic lighter you are well equipped for making a fire.

I love knives and have quite a few but it's a rarity that I actually carry one on my belt. Never really thought much about it til reading this thread.

I prefer the sharp spine to the average striker tool. It will generally produce far more sparks and larger sparks than say the striker that comes with a Light My Fire Scout. The striker tool is just one more thing that potentially will be lost when you need it the most.

A 90° spine is used for more than striking a ferrocerium rod. The edge can be used to scrape cedar tree bark to create kindling or to create micro curls from a chunk of wood or scrape birch bark to create kindling. Any time you can save the working edge of the blade and not dulling it you are doing yourself a favour. The 90° edge on a carbon steel blade also improves the ability for it to strike flint to create sparks.