Along with giving out a WOW to the Rat-1, I would give a WOW out to both the Joe Pardue Utilitac II, and the Kershaw Tremor. They are all winners in their class at less than $30.00.
I actually have all three of those knives. For heavy duty use in my contruction job, I wouldn't want to live on the edge of difference between the RAT1 and the Tremor. These are excellent work knives, regardless of price. Their blade designs are great and although they function differently, they both have their strong points that to me make their utility value equal out.
The RAT1 with its open frame construction is easier to clean out. Its flat ground blade will get reall sharp, and I don't worry about goofing up the edge because it is so easy to sharpen.
The Tremor is a better slicer, no doubt. With a semi hollow ground edge, this will take a laser edge with little difficulty. However, the steel doesn't hold it well for that long. When I try to clean this knife out it is a pain because of its nearly closed construction. So no gooey solvents or sealers, no tar or caulk use for this knife. While the edge is thinner and not as sturdy as the RAT1, if I just use it as a knife, no problems as the edge stays plenty well for an EDC work knife. I love this knife.
The Joe Pardue UT2 is the least heavy built of the group, but still a fine knife. The fit is and finish on the one I got was great, and the action butter smooth. It is just small enough and the blade edge fine enough (another FANTASTIC slicer) that I don't carry it as a work knife. Unless that is, I am doing carpentry work all day. The grinds on this knife get the edge so fine that it is great for any trimming of molding, sharpening my pencils (25 times a day), cutting trim package banding, opening adhesives, etc. Another great knife.
The other large knives I carry to work cost significantly more ( $100 or so ) and don't perform significantly better. All three of those will stand on their own merits and make great working knives.
BTW, I have a Tenacious. Least favorite because the slab sided blade allows for the least fine cutting. Nice knife no doubt, but again, the slab sided blade into a wide handle takes up way too much pocket space for me by the time I attach my phone case and occasionally a tape measure to my pocket. None of those worries with the other three mentioned above.
Robert