I have a Ranger Entry Tool in my car, because I feel that its design is better suited for urban rescue than suburban survival. I have a GB Wildlife in my camp/survival bag.
Justin and I tested the Ranger Entry in Baghdad, pics are up on his website last I checked. We chopped through the c-pillar of a peugeaut (sp?) (little french pos car) in a minute or so. If you had nothing but an Entry Tool, 5000lb strap or chain, and your car, you could peel the roof off of a rolled vehicle in about 5 minutes to rescue the occupants. There was no edge damage to the entry tool after cutting through the c-pillar. We had to chop red masonry bricks and road-curb concrete (far, far denser than cinder-block concrete) to get the edge to roll and dent. The rolls and dents were small though, and the edge was still sharp overall. No chips at all, either. He really heat-treats his S-7 well, and the edge geometry is designed for those kinds of heavy impact work. The only weak points of the tool are that the small lip on the hammer breaks off when breaking stones, and the gas valve-shutoff hole milled into the top of the handle creates a weak point when prying. By that I mean several hundred pounds of energy, like two guys pulling at the same time. If you break it, I'm sure Justin will replace it as long as you provide the "how I did it" story. And you'd have to be a pretty big guy. So far it's been tested by several fire and combat units who've given it favorable reviews.
Hell, I'm a combat unit, and I bought one after testing Justin's, so I've put my money where my mouth is on this one.
Ok, all that said, if you need firewood, you'd be better off with a GB or Wetterling than a Ranger Entry Tool.