Since you are asking about our experiences with Cisco UCS, here is what we've accomplished so far.
Our greatest accomplishment is server consolidation with the use of virtualization. We bundled our UCS system with VMware vShpere with vCenter management. So far, we are currently on-track to virtualize all our major services and servers.
As with any virtualization effort using commercial products, the cost is very significant. However, we look at this not just as a one-off project but it will be the foundation of our future systems and services as well.
Ultimately, the goal is for better services. Right now, our server reliability has improved, and this has translated to lesser down times. With the servers virtualized, it's also very easy to manage and perform tasks.