I ordered a WCS C-260 over a month ago through my local shop. It finally arrived this past Friday. It is a BB Black 110mm stem.
I really like the graphics as they are more subtle than on the WCS 4 Axis that the C-260 replaced.
The C-260 does seem stiffer using the subjective test of standing in front of the bike, grabbing the handle bars and pushing down a few times. On the road I cannot feel a difference but the stiffness of a stem probably only comes into play during sprinting or hard efforts out of the saddle... neither of which were part of my two rides with the new stem.
The 110mm stem weights 109 grams, which is two grams more than my 110mm 4 Axis stem after I replaced the 4 Axis stem's bolts with Ti bolts.
My one complaint about the C-260 has to do with the bolts. They are soft! The bolts have a small diameter and require a 3mm hex. There are three bolts at the steerer end and four at the bar end of the stem. I used my torque wrench for the finall tightening of the bolts and on several occasions, even through the wrench was properly seated, the soft metal of the bolt head was deformed before I reached 5 Nm.
I wouldn't be suprised at the softness if the bolts were aluminum, or even low quality Ti, but they are made of steel (a magnet sticks to them) so I expected them to be hard(er). I guess the take away is that if you purchase this stem, pay close attention when tightening the bolts, make sure your wrench is properly seated and apply even constant pressure when tightening. Also, it goes without saying, use a torque wrench.
Here are some quick pics of the installed stem (I know, I know, now that the stem has been installed, I need to trim the steerer tube above the stem).