I'd buy one.

My reasoning:

This is not an every day tool. Its designed and intended to be carried 24/7 in a manner that protects the firesteel but is extremly durable. One of the major problems that I have with firesteels - and I speak as someone who carries one for 16 hours a day - is protecting it. The best solution that I have come up with so far is to coat it with nail varnish. Which works, but I have to recoat on a regular basis.

Also the build quality looks to be extremely good. The firesteel is replacable. I like that.

One final point: you get what you pay for. If this is as good as first impression suggest then I expect this to become a benchmark. Think K&M matchcase build quality.