This addon does not compare item that have procs like trinkets and legendaries, only pure stats items.
Update for Legion pre patch with major improvements (see the change log for details).
Very simple addon to compare items and find which one is better for you!
You must set the weights for all stats on the proper Windows (weights can be found on askmrrobot or you can set them by yourself).
to open the addon main Windows type:
/isc or /itemstatscompare
if you find any bugs, please report on the comments section.