Long story short... it's very nice.
Some interesting benchmarks on the new version... http://mikaelronstrom.blogspot.com/2012/02/105bn-qpm-using-mysql-cluster-72.html
An 8 data node setup was benchmarked at over 1 billion queries per minute with commodity hardware. Let's break that down... 16.7M queries per second for the DB cluster. Break that down further to individual nodes, and it's still pretty impressive... 2.1M queries per second on average for each server/node within the cluster.
Not just limited to reads (reads are of course faster), but write capacity is impressive as well... doing 1.9M SQL writes (update/insert) per second.
Little summary video: http://www.oracle.com/pls/ebn/swf_viewer.load?p_shows_id=11464419