It will do both actually...  it will absolutely eliminate the complexities of ESW/UCSS and managing each of those individually for multiple applications.  Secondly, CUWL will absolutely save money for a customer over the course of your Unified Commun...

For those interested in learning more about the UCSS framework, see here: http://www.cisco.com/go/ucss.  There is a good presentation (.pdf) under the Additional Resources section that explains everything.  I will try and help those posting comments ...