To start on a positive note, you get a lot for your money with this program. It has many nice and interesting features (versioning, a goal meter and a full-screen view that lets you switch between documents, to name my favourite ones).
The weak point of this program is not its features but its interface. How any serious writer would be able to concentrate on his work with this confusing mess of palettes, buttons, levers, tabs and drawers is beyond me. The blurb above rightfully says that "any creative process is inherently messy", but the developer seems to have followed this truism too closely when he created the interface.
Judged by the comments here, CW seems to have many loyal fans. I don't want to question their rave reviews, but I suppose that this kind of program mainly appeals to technical writers, or to people who equate a crowded, unintuitive interface with professional software.
This is definitely not a program for writers who think that playing with ideas and words and plots is more rewarding than fiddling around with clumsily implemented software features. If you want a simple, straightforward program that stays out of your way but gives you all the flexibility you need for composing and rearranging your stuff, you will have to look elsewhere.
There are not many options, but you should check out Jer's Novel Writer, a program with a very, um, novel concept and very intriguing ideas about how a "creative writing" program should work. Another option, though a very expensive one, is Ulysses, arguably the most elegant and mature program in this niche. (It was the first to introduce full-screen mode, which says a lot about the inventiveness of its developers.)
None of these programs can "help you write better" (quote from the CW ad). No program could. But if you need proof that writers were better off if they still had to use quills and parchment, CopyWrite would be a great piece of evidence.