I have the BK2 Companion.  I purchased it before the Crewman was released.  I wanted a hammer, digger, prybar, cutter and wanted a knife with a 5" blade.  The Companion was my answer.  It has its strengths and weaknesses, for me.
It is heavy, it is very sturdy, it is indestructable.  I have used it to chop wood and it does fine.  I have used it to pound but the butt of the handle makes that difficult.  It is not a knife for fine cutting like cutting associated with cooking.  I had to use it to dig foot holds when I tumbled down an embankment.  I used it once to punch through the trunk of a junked car just to see if I could get into the trunk.  I could.  The sheath is Kydex. Its unremarkable.  I plan to have the handles sandblasted and thats it for mods.  Given the above, it still looks new.
Get another knife for the finer knife tasks.  The SAK/Leatherman would be just fine.
Twice the price of the Crewman and twice the metal.
I have seen the Crewman and handled it and would buy the Companion again.