I downloaded the demo version of Igor Pro a few days ago and was so impressed with it that I bought it! My decision was not impulsive, however, as I have researched many products and I use other graphing and analysis programs (S-Plus, Grapher, Gauss, O-Matrix, etc. all of which are top notch). In addition to a truckload of features (too numerous to list) Igor Pro just has a good feel to it.

The program makes it easy to import data and quickly analyze, process, rearrange, visualize, present and use that data. Igor Pro includes a simple, efficient and high level programming language which, in addition to facilitating data processing, allows for simulating data. I have found it to be exceptional.

I heartily recommend Igor Pro.