I created a model with Qlikview at its early beginning in France. But it was more adapted to simple data/KPI visualization than budget planning with complex business rules which are the main parts of my projects.

Previously, multiple Excel sheets were used by us. We not only found it difficult to consolidate but also calculations were not centralized and had no security around the data. However, TM1 provides centralized data in a secured manner and calculations are done on the fly without any delay.

Prior to TM1, we had been using IBM Cognos Planning.

TM1 is a lot more scalable than IBM Cognos Planning. IBM Cognos Planning is only an Enterprise Planning tool. However, TM1 is also an OLAP reporting and analysis tool, in addition to being an enterprise planning tool. TM1 provides more capabilities for customization.

We were not using any other solution previously.

I have used SAP solution before. SAP is rigid, and I prefer IBM since it is easy to deploy. 

I did not previously use a different solution.