I have the Mule.
It is one bell built, affordable knife. It's ergonomics is simply outstanding, the handle is one of the most comfortables I've ever seen. The lockup is very good, no bladeplay in any direction. Thumbstuds are grippy, the knife is easy to open with them, but forget about flipping.

It is kinda hard to close with one hand, but this is a well known downside of lockbacks.
This is my first knife in AUS8 steel, and I found this material fine enough. Of course the edge retention is far from M2, 154CM, BG42, but very easy to sharpen, and can be honed to virtually razor sharpness. I haven't abuse it yet, so I can't give you informtion about chipping or rolling, but it seems like Ka-Bar's AUS8 is a little on the soft side (maybe around 56-57 HRC).
Dissassembling and cleaning is easy if you have the proper sized torx driver. The screws are quite good, they didn't stip during proper dissassembling unlike the ones on some much more expensive kives. Believe it or not, this is a very important consideration. The whole knife would be much better with phillips screws though.
It came without a pocketclip, but this problem is
easy to solve. The sheath is a quite good one though; it can be carried vertically and horizontally.
The blade is quite thin for it's size, just a hair above 3 millimeters (.125). I think my older Cuda Quik-Action or a Buck Strider 880 could beat the Mule's thin, tapered, hollow ground blade to death easily. Of course it's strong enough for any normal task, but I would't try to use it even for light prying.
Oh yeah, one more thing; the Mule was stupid sharp out from the box, nearly as sharp as my girlfriend's Kershaw Storm, although Kershaw's NIB sharpness is legendary. Kudos for Ka-Bar for this!
Anyway, it's a good, dependable beater, sharp, extremely comfortable and inexpensive, but because of the thickness (thinness) of the blade and the deep hollow grind, it doesn't look as indistructable as advertised.
If you have any more questions, just ask.