I installed it an ran it today, and was very impressed. It's is
incredibly well-done and slick, with lots of the little tweaks that make
things usable and intuive.
For instance, the project browser tab was on the right hand side, and I
was able to drag and drop it to the left hand side. Things are very
dockable ala Jedit or IntelliJ, with nice features like auto-hiding and
push-pins to hold the pane in place.
It also takes some of the nicer features of emacs and incorporates them
into the key-bindings and menus.
I'm also fascinated by the fact that it is written in SmallEiffel + Fox,
with some C for the Ruby debugger.
I only ran it for 20 minutes, but had no trouble finding my way around,
and didn't encounter any glitches. So with that limited exposure, I
can't comment of bugs/feature set, but it looks like it will be a
significant IDE, and well worth the price. Hopefully later in the week
I'll get some more time to look at it.
Another thing worth noting- there was no tiresome registration to
download. That was refreshing.
Nick