I've used the keyboard for 3 years now and have mixed feelings about it. The controller knobs aren't brilliant for precise usage (as mentioned above) and I've never found it to integrate that well. It does work well though, or I wouldn't have kept it!!!
To be really, really honest if you want to get a really good controller then get yourself the Nektar Panorama.
It has by far the best integration with Reason and their customer support is unparalleled.
If you're a bit strapped for cash and like Automap then Novation's Impulse range seems to be heading in a similar direction for Reason. But by no means on the same level as Nektar!!
I guess it depends on how soon you need it in your hands!
Read the reviews about Nektar here on the forums and see what you think.