secload -o experience?

We're migrating platforms and environment release levels (Win03 -> Win08 & Env 9.0.1.5 -> Env 9.0.1.11).  The process of loading, configuring, and testing the new production environment will last about 6 weeks.  Secload was used initially to enable testing, but I'm thinking about the best way to load the latest LAUA security changes from current production to the new environment.  If we opt to continue processing security change requests in production (including new and terminating users), the secdump / secload -o command pair seems like an attractive way to glean everything out of current prod just before cutover and deploy it in the new environment.  It's a little intimidating erasing LAUA settings (the effect of the -o flag) on cutover weekend, not having prior experience with that command option.

Any admins out there try this before?  How did it work for you?