Sunil Agarwal talks about batch mode processing with columnstore indexes:
While these results may not appear as dramatic on my laptop, the picture below shows the performance gains with Window Aggregates on a Server class machine with large DW database. The orange bar represents the query speed up we got with Window Aggregate operator in BatchMode. The highest speed up we saw was 289x!!
Batch mode is generally a huge benefit for data warehousing environments.