I agree with John Hobson.
When it comes to planning TM1 is better than Analysis Services.
I don't know how well Outlooksoft mitigates the weaknesses of Analysis
Services.
You must remember though, that the underlying OLAP architectures of
Analysis Services & TM1 are different.
TM1 being RAM based is good at planning.
AS writing back to a relational table makes planning a bit more tricky.
Maybe I'll review AS+Outlooksoft v TM1 some time.

Regards,

John Keeley

www.johnkeeley.com