The BOSS Jack's popularity is really odd to me. At first, everyone said they'd be instant classics, but now they're so difficult to sell on the exchange. At first it also seemed everyone favored the CGs because of their thickness and "Busse-ness," but later on the LEs became more popular because of their thinness and slicing ability. Most people need liners to thicken up the handles, though.
INFI is INFI so you know it'll be reliable, but to me, the BOSS Jack stands out aesthetically. It's long for its width compared to other Busses, and that's what makes it sexy to me. It's sleek, it's low profile, and its curves are conservative yet elegant. It knows how beautiful it is, but it's modest. It's not outspoken, but it's confident. I used to have a double cut one with black paper Micarta--I'd never seen such grace in a knife before, much less a combat knife. I got three more after that, and I'm expecting one from the custom shop, hopefully by 2015
I hope you weren't expecting some more useful thoughts and reviews on its uses. Sorry I never got to use mine much, but I will say that with other knives this size, it was too long for long-knife chores, yet too short for short-knife chores. What I did use it for though, it was just fine, and I felt good carrying mine.