I have been carrying one of the plain edged ones for a while now. Have considered typing up a review. The steel, may not be as good as the more expensive spartan blades version, to us, but who needs edge retention on a dagger, it is not appropriate for EDC tasks, really a sole purpose weapon. The sheath is fantastic and very versatile. Could be clipped iwb, if you're into that, mine rides clipped into cargo pocket, weak side, with a short length of cord attaching the bottom holes on sheath to clothing, button hole, etc. If you wanted it for plate carrier carry it will slide behind a three mag shingle and clip on, or you can remove the clip and attach anywhere desired with included para cord.
The blade is well designed, easy to draw with only the index finger and falls right into the proper grip. Definitely a light weight, easy option to increase your capability in a defensive role.
I dont have much need for glass breakers, but I did just order one of the new grey ones from knife center with the double edges, serrations and so forth. They are reasonably priced and cant hurt to try out. I think part of the procedes benefit some of our warfighters so win, both ways.
Best of luck, let us know how you like it.