What do you like best?
As a data analyst, I deal with a lot of data. I like to look at the same data in multiple views, with different filters, historically, etc. However, that means that I will have to create multiple files. With TM1, I don't have to do that. Once I export it to Excel as a formula driven file, all I have to do is edit the cell that it is pulling from. For example, if I want to see 2016 data when I pulled 2017 data, all I have to do is change the cell that contains 2017 into 2016 and press F9 (which will refresh the page).
What do you dislike?
I dislike that it takes a longer time for the file to process if the file has a lot of data. Also, if the file exceeds a certain amount of lines that it will export, it won't work, which means there is a limit to the amount of data that you can work with. Also, it isn't super flexible with the reporting. You can export it so that it has no layout or the given layout. However, the given layout looks old.
Recommendations to others considering the product
It definitely takes time to understand it as a user. However, if you are doing more than pulling data and exporting it, such as creating a separate cube, you will definitely need training from IBM or take a professional course.
What business problems are you solving with the product? What benefits have you realized?
We use TM1 for budgeting, forecasting, and anything related to financial planning. We have different cubes for different purposes and can be used by many different users because it is versatile.