I'm not sure if it's just for collectors or for use, but technically sterling silver "shouldn't" tarnish under normal shaving conditions. You will probably have to make sure it's clean and dry after use, though.
I'm not sure what the quality of the plating is like on that, or the material which has actually been plated underneath, or the quality of the silver. I'm actually surprised it's silver at all (if it is silver). I think Merkur do a chromed stainless steel handle for the Sensor which is probably more suitable material-wise for everyday use.
Here's the Merkur version if you haven't seen it: <!-- m --><a class="postlink" href="http://www.dovo.com/_english/merkur.html#">http://www.dovo.com/_english/merkur.html#</a><!-- m -->
Scroll down to the "MII" razor.