ZEBA  How does this compare to Igor Pro lately?  
(Version 6.1.9)

ANONYMOUS  With all the features you get for $95 (what is the cost of competing packages?), its intuitiveness (how fast do new users learn Igor?), and the good stability and user-support, this is an amazing program and I can only give it maximum rating. Great value for your money, great useability, and it provides 98% of all the features you will ever need for data and function analysis purposes in a very accessible (and easily expandable) way. It is much better to get 98% of what you will ever need in a package that is so approachable that you won't forget how to use – rather than to get 99% at the cost of a complicated and difficult to learn program.  
(Version 6.0)

ANONYMOUS  Good program. But, note my ease of use and feature ratings are both high even thought I believe for many users it will be rather low. Basic graphing is on par with the old Cricket Graph 1. But, I rated features high because it is highly programmable. It is much easier to get started in that Igor Pro, but not as powerful.

People who don't read the clear instructions on the site for the difference between demos and betas shouldn't have their ratings counted.  
(Version 6.0b8)

FRUSTRATED STATISTICIAN  this is NOT a demo - after sitting thru the d.l on dialup, it promts for a pw to test it. BAD BAD BAD!  
(Version 6.0b1)

EMILIO CRUZ  I´v ebeen using pro fit for severla years now ,and it´s the perfect replacement for DeltaGraph. Granted, it doesn´t support as many chart types as DeltaGraph but is moe powerful due to its Pascal programming.

I´ve used to teach calculus as well as programming and it is one indispensable tool.  
(Version 5.6.4)