freebsd stable - Aug 2008 - How reliable is make delete-old and make delete-old-libs on 7.1-PRERELEASE?

How reliable is make delete-old and make delete-old-libs on 7.1-PRERELEASE?

I ask because I just upgraded a remote system from 6.3-stable to 
7.1-PRERELEASE.  All seems well so far.  Apps are running fine.  I just 
figure I should do this final bit.

FYI, I've written up how I did this migration:

   http//www.freebsddiary.org/upgrade-6.3-to-7.0.php

At the end, I've included the output of make check-old.  Does it look 
good to you?

Thanks.