I just got the spearpoint. Nice blade. I held it next to my Sebenza, and saw a lot of similarity in the outline and size, the Strider being slightly larger and thicker, of course. They are both open-back construction, too.
The liner is massive. I'm not worried about it collapsing under any foreseeable circumstances. But I'm not exploring the far side of the moon, either. You could probably hammer nails with it as a spine whack test.
It sharpens up very nicely and keeps the edge, too.
A tanto can't be as generally useful. This isn't a kitchen knife, but I tested it out on veggies, and I can't see a tanto, however sharpened, being as adaptable to that kind of slicing.