I have used a 12" MPK in A2 and Ti. I would put them above the offerings by Cold Steel, McClung and most other production blades, and below the Swamp Rat line, but the latter is based on a set of personal preferences which I will describe as follows and you could go either way.
The handles on the MPK are more durable than the Swamp Rats both in regard to impacts, puncture, cuts, abrasion, heat and probably chemicals. The Swamp Rats have a finger choil which can aid precision work, however the MPK can come with a couple of inches of serrations which will vastly increase cutting ability and edge life on a lot of materials. You can get serrations on a Busse but I think it is consider a custom option and likely to be costly.
The edges are similar, both are full flat grinds, the Mission is slightly thinner and the Swamp Rat slightly more acute. The real difference is in the tip structure. The MPK has a much thinner tip and thus is much weaker than the Camp Tramp (from Swamp Rats), but is a lot better for precision work. The Camp Tramp's point is simply more robust and better suited for heavy tip prying and that type of utility work, its penetration is also enhanced by the penetrator tip.
-Cliff