Most important MySQL Cluster features

High Availability
Distributed, shared-nothing architecture
Synchronous data replication
Fast Failover
On-line operations (i.e. add nodes, upgrades, schema changes, etc)
On-line back-up
Self-healing (i.e. automatic node recovery)
Geographic redundancy / replication
ACID Compliance / Transactional
Low latency / real-time operations
High write (UPDATE) performance
High read performance
Multiple interfaces / access methods to the data
Ability to scale out on commodity hardware
In-memory data storage
Disk-based data storage
Automatic data partitioning
User-defined data partitioning
Multi-platform support
Open source licensing / distribution
Low cost of acquisition
Low cost of operations