I had ones made by Coghlan's and ones made by Doan.
The only difference I could see was the Coghlan's had Coughlan's stamped into them and came in a blister pack while the Doans were loose in a bin at a surplus store and cost about me about half as much as the Coghlan's did.

Like I said, my only complaint with them was that the spark rod wore out.
(I think you guys who use the cutting edge of your knife for spark striking should file or grind a small section of the back to a square edge and use that instead.)