The library is very easy to use and the code is very flexible. I used it to create a tool that could be used by any user to create a custom formula and then use it as a template to create formulas for all the users.The library is very easy to use and I can create the formula in python and then use it to create formulas for all the users. I can't think of anything I dislike about the library. I am using it to create a tool that can be used by any user to create a custom formula and then use it as a template to create formulas for all the users.