The Goliath is a great knife IMO, a sleeper I guess, as it's been discontinued. I've had one for about 3 years, it's a good work knife. It is NOT a prybar though, that's for sure. It is one great slicer and carries quite nicely in my back jeans pocket, as it is really quite light for it's size. My only complaint is the lack of a thumb stud, I do like my knives to open one handed.
I posted a thread about the Goliath several months back, as a member of the Mega-folder family that had been overlooked. I would love to have one in premium steel! As a matter of fact, I'm having a knife made for me by Ray Rogers, that is quite similar to the Goliath, although it is a design of his own, the Chupacaba. The "Chupi",
has titanium sales, a BG42 blade in a trailing point style, with 4" inches of sharpened edge! The whole thing will be about 10.5" long open! The Goliath is about 9.5", so you get an idea of the scale.
Anyway, I think your Dad would like the Goliath as a hard use knife and it's available at a price point that would allow purchase of a 2nd as a back up. The sheath that comes with the Goliath also will accept the Strider/Buck folders.