The best part is that I have been able t use my Excel skills while working with this tool! It was difficult at first as there are many functions available but it has gotten easier after using it over 1 year now in multiple different projects within our organization where i am currently an auditor/data mapper (in charge). There really isn't anything bad about EM DataMARTs so far except if someone asks me what they should do when running into problems or something along those lines then all we talk about will be how much better EM DATAMARTS IS than other products out their! We've used these tools before however not nearly enough given the benefits offered by them such us easy access via excel files etc.