The Good
Gene Pattern is probably the best and most comprehensive free online software biomarker discovery and genomic data analysis software packages.
The Bad
Although it is one of the easiest, it may still take some time for the average user to learn how to use. Also, if you plan to work on multiple data analyses, it can be a bit time-consuming.
The Bottom Line
After looking into many free biomarker discovery software packages, this seems to be the easiest to use and the one that offers the greatest array of functions. If you have more time to spend, you may want to try more specialized alternatives, like R and Matlab.