I only give out 5 stars if I can't find anything substantive to criticize.  This is my first Diesel. Only drawbacks here are legibility and thickness.

A few observations:  It's a nice looking watch, thicker than I was expecting - a good 12mm - which makes it look a tad awkward IMO, protruding from the wrist. Gotta lash it down tight to compensate. Face + bezel is a good 47mm from side to side, but it doesn't look much oversized because the strap is nice and wide - almost 1" wide - complementing the fat face.

The leftmost and bottom subdial are a stopwatch.  Left is the minutes elapsed and bottom is seconds elapsed. Hit the reset button and the hands unwind however many rotations it takes to undo the time measured. Rightmost dial simply shows the 24-hour cycle.

Note the dial markings and hands are chromed, except the luminescent spots, which means it helps to have reflected light to read the time.  Not a problem outdoors, but indoors markings can be low-contrast. At times takes a few seconds to figure out the hand positions.  Speaking of luminescence, it's nice, but usefulness is marginal as it fades pretty soon.

Supposedly it's water resistant enough to take skin diving (according to the manual)- 10 BAR. My watch did not come with the correct manual.  The manual that came in the box covers maybe a dozen watches, but not this model (DZ 4165). :( oh well - I decided I don't need it badly enough to contact the seller, Dexclusive.

The backplate is screwed down. The window crystal is domed for strength, yet the bulge means it'll contact rough surfaces if given the opportunity. Not sure how scratch-proof it is. I've only had it for a week or so and it doesn't appear to be running fast or slow.

We wary of Amazon's "black/blue" color description. I figured it was simply wrong, but discovered after ordering that Diesel does make a black/blue model (blue faced).  However, vendor Dexclusive shipped the pictured black/silver/yellow color scheme I was hoping for.  Crisis averted.

 *** July 18 2012 update ***
The watch fell a couple feet onto a tile floor.  The chrome trim that rings the date window broke loose and now rattles freely around the watch face.  No longer glued in place, it can (and did) interfere with movement of the hands.

 *** July 30 2012 update ***
Still ticking after visiting a water park.  Submerged the watch many times and it was not affected by the water.  Window crystal is still unscratched. <3 The loose trim piece (mentioned above) has wedged itself into a corner so it's not currently interfering with the hands. I plan to open the case and remove it at some point.