Review on GoJS by William Hunter

It's very simple tool which has everything you need in one package (especially if your needs are just drawing graphs).

I like that they have many ready-to use samples so there is no learning curve at all! You can't customize some things but this does not mean we should complain since those features do exist somewhere else anyway :) The only minor thing - maybe would be nice when user clicks something or double click node/link title then tooltip shows up instantly without waiting until mouse pointer leaves canvas area after clicking anywhere outside diagram borders? But overall great product from Microsoft! We were solving our problem by using visual representations as part off data analysis process before going into detailed statistics calculations later stage :D.