I've got one, but never got round to fitting it to my PPP. I stuck it on my motorcycle keys, as an emergency helmet strap cutter, temporarily. I reckon it would get really gunked up with tape if you used it to open boxes.
I thought it was really smurfty, not really sharp to begin with, doesn't stay sharp and can't be sharpened.
Not a fan of the V-cutter. I own one SOG V-cutter, on my Blacktip, and one is enough. I can understand for a rescue tool to cut seatbelts, but not on an EDC tool.