Can I just say about the Blastmatch that the one I have had for about 3 years has been fantastic. No way am I linked to whoever makes them just happy to use one.
Amongst many other firemaking tools I have been using my one in the classes I run and have had no problems with it.
I appreciate that they are more prone to fail (based on what others have said) in comparison to a normal Swedish firesteel or traditional steel but please do not dicount it as it is a great training aid especially with groups of kids.
When I have large numbers of kids to teach/entertain/keep out of trouble I sometimes use the Blastmatch with char cloth. I line up on a piece of wood one piece of char cloth per kid then they take it in turn to light their cloth with the Blastmatch. Any kid who is not stong enough I get them to plunge it with the assistance of one of their friends. All this has to be done very fast to build a team spirit.
When all the clothes are charring they are piled into a tinder bundle, one kid holds it and the rest take turns blowing it into flame. Works a treat and then time permitting then I move onto strikers new and old, and then to friction.
Do I carry one all the time? No.
Are they a Gimmick? Probably yes but kids love them.
Could I rely on one? Yes. If the plunge system fails or the rod comes loose it will work just as a normal striker with a sharp piece of rock.
As a different teaching tool I think they are great and are good for fast team work getting a fire going. Keeps kids interested and makes them more willing to try harder methods after seeing they can make fire in what many would call more bushcrafty ways.
Cheers
George