Migrating websense from ISA to ASA

We are about to migrate from ISA to a Cisco ASA 5515. We are using web security 7.5 with an ISA cluster for a web proxy. From all the research that I have done it seems like a fairly straight forward migration using this documentation:

https://www.websense.com/content/support/library/web/v71/wws_pdfs/install_cisco.pdf

http://www.cisco.com/c/en/us/support/docs/security/pix-500-series-security-appliances/97277-pix-asa-url-filtering.html

We are looking to move our websense server into our DMZ as part of this migration. The SQL server will still reside on the internal network. I believe that we will also need to upgrade to 7.6+ and we will probably upgrade to 7.8.

I would like to know if anyone has performed this migration or anything similar and come across any issues with the migration and whether it has been detrimental to the service?

Thanks