Why is TM1 in limelight?

Only product in market that can be used for “OLAP Analysis” & “Planning” using “Multiple cubes” stored “in-Memory” .
Earlier, TM1 was available in 32bit technology. Limitation is 2 GB RAM. Targeted at solutions having limited data.
With introduction of 64 bit Technology, the available RAM is upto 1TB. This enabled TM1 to target solutions that handle large amount of data.
Sparcity removing algorithm.
Post Cognos Acquisition, TM1 is on long term road map of IBM.