Over the summer several of us involved in the design, testing and development, deployment, and data analysis of the SPTpol project published some papers about the then current status of the camera and data in the SPIE conference proceedings. A ton of work has been done since these papers were submitted, but it should give you a good idea of how well the camera is working. Here's a list of links to versions of all our papers available on the arXiv:
Austermann, et al. 2012 - SPTpol: an instrument for CMB polarization measurements with the South Pole Telescope
de Haan, et al. 2012 - Improved Performance of TES Bolometers using Digital Feedback
George, et al. 2012 - Performance and on-sky optical characterization of the SPTpol instrument
Henning, et al. 2012 - Feedhorn-coupled TES polarimeter camera modules at 150 GHz for CMB polarization measurements with SPTpol
Sayre, et al. 2012 - Design and characterization of 90 GHz feedhorn-coupled TES polarimeter pixels in the SPTpol camera
Story, et al. 2012 - South Pole Telescope Software Systems: Control, Monitoring, and Data Acquisition
The papers are fairly technical, but if you're interested in how the camera works, how it was designed and why, and how it's performing these are great places to look. Obviously a lot of work goes into a project like this and these papers represent only the tip of the iceberg! Within the coming months and year we should have several science papers being prepared for release. SPTpol results are going to blow. your. mind.