I'll have to through in a word of caution.
This is not a knock against TOPS. This is "test your gear before you need it."
As witnessed by myself and the friend mentioned:
While not sourced directly from TOPS, a friend purchased the same rod (likely the same rod, but I cannot be 100% certain), which failed to provide adequate sparks from the ferro rod portion. Instead, continued striking wore away the rod. Weak sparks every eighth strike or so.
It was struck with a P38 can opener, Light My Fire striker, squared knife spine, Corona sharpener, and SAK saw. These same strikers were used on a BSA hot spark as well as a Light My Fire Army model ferro rod for comparison with satisfactory sparking.
My guess is there was a QC issue with that batch of rods and may well be an isolated issue.
Again, this is a word to check new gear before heading into the woods.
I otherwise like the form factor of the TOPS unit over the DOAN, like the inclusion of magnesium over the BSA Hotspark (which I have on my keychain), and it's NOT one of those latest misch-metal made-in-China you-have-to-strike-fast-and-away-from-tinder roads. I've gotten to rather dislike those new rods.