Earlier quoted context omitted.
> Cant I replicate all of the features it has with off the shelf tools/editors that are free? You obviously get the convenience of NOT having to replicate all these, and the guaranteed experience of those parts working together as soon as you install it, and with a nice GUI at that.
Sounds good but still not convincing. For example, R can do the same thing, too, or even better. And it can be integrated with other programming languages. I would never buy it either until somebody really shows it's worth the money.
I've been interested in playing with Haskell for a while but I've been put off by the need to setup existing tools. Having an all-in-one package with neat presentation, packaged libraries, and immediate feedback sounds like a great deal for $25.