Amidst the clamoring I have successfully rolled this patch out to 2 clients without too much problem. I did discover a bug I noted above, but for the most part if we recognize that SP1 is less a service pack and more a bundling of new features and options and thus effectively a new build and thus go through the proper testing all the upgrade issues are fairly predictable and not hard to work around.
Once upgraded, I will say the EMC "feels" snappier in it's response time to the little things like manipulating database copies and submitting changes to AD, and some of the new flags available in the prepare-moverequest.ps1 are a godsend for the ADMT first, ask questions later folk.