Rephrased the note some more.
--- a/spec/identity-respec.html Wed Feb 06 16:57:50 2013 +0100
+++ b/spec/identity-respec.html Wed Feb 06 17:02:42 2013 +0100
@@ -425,8 +425,7 @@
<p>For example, if a user Bob controls <code>https://bob.example/profile</code>,
then his WebID can be <code>https://bob.example/profile#me</code>.</p>
-<p class="note">Hash URIs are encouraged when choosing the WebID URI. All examples in the spec will use such hash URIs. Even though 303 redirects have been used in the past, experience has shown that they can be difficult to deploy and have an impact on performance for clients.
-</p>
+<p class="note">Hash URIs are encouraged when choosing a WebID since 303 redirects impact performance for clients. All examples in the spec will use such hash URIs.</p>
</section>