I see several improvements to a regular spark lighter (as in the DR Kit) in that one, besides the stronger brass construction. The grinding wheel looks larger. That means it will be easier to rotate and it will produce more sparks at a time. The bottom screw for the flint installation is what I had to improvise on my DR sparklite. It's very easy to replace flints and also you can throw in at least 2 of them into the tube (3 if you shorten the spring a bit) - that's enough to forget about replacing them for years.

Bic lighter is nice thing while fueled, but its weak sparks (especially on a worn out one) are not good enough for natural tinder you can find in the field. Sparklite, on the other hand, produces a lot of really hot sparks to light up even a wet tinder. Just let them dry it a little by sparking over the same area several times.

My only concern with this lighter is corrosion. It looks like it is made of 2 milled pieces set tight on a thin wall tubing. These joints may fail very quickly in wet climate and the lighter will fall apart. I would coat it in epoxy paint at least or use solder iron over joints.