A little late on the reply here, but my two cents:
A few years back (2005 or later) Runner's World gave the Puma Complete Trailfox their "Best Debut" for a trail running shoe. I was running consistently on trails at that point, and had tried several brands of trail shoes by companies who knew shoes, but perhaps not trail running shoes...Asics, Nike, even Keane. I instantly fell in love with the Trailfox. They made them for about 3 years. When they discontinued the line (and replaced them with something called a trailfox 100, which didn't look like it was even the same shoe), I bought a bunch of extra pairs so I wouldn't have to run without them. This is not my typical reaction...I love trying new running shoes, but I honestly couldn't bear to let these go so easily.
Now I'm nearing the end of the lifespans of those shoes, and looking to try again. I notice Puma has new trail shoes, and the Pumafox looks very similar, both in tread underneath and overall shoe shape. They look just a little bukier, but I'm going to give them a shot, based on what I think they're trying to be....
So, in summary, the Complete Trailfox was a great shoe, confirmed even by Runner's World. Since then, they have had a few fits and starts, but I'm hoping they know what works now, and I'm going to give that Pumafox a shot, because it looks like the Trailfox. The Nightfox does not, at all...in particular, the tread on the Nightfox doesn't look very aggressive, like a half step above a road running shoe. But if you're running on farmland and some tracks, then you might want to try the Nightfox. I wouldn't hesitate on either, though!