I recently sold my Seb to fund my Xm-18 and I think it was a good move for a few reasons.
First, It has a superior steel. I went with the CPM20CV. This steel at their RD has proven to me tougher and hold an edge longer than the S35V CRK uses. I am not really all that sure about what I think on their soft RC. They say its for ease of sharpening, but I have experienced them dulling very fast and to the point of a crappy edge after some light cutting of cardboard, or some rope. I love the SEB but hated hated hated the fact that it would dull while in my pocket.
Second, I love how the RHK can be customized to your liking. Not everyone likes two plain slabs of Ti (me personally, I like the look of the seb). With that being said, I feel that a Combo of Ti and say G10 gives the knife more personality. Especially since there are so many different configurations that you can put together to suit your liking.
Third, they are just as easy to take down as the Seb. There are no special tools involved. I can hold one side of the pivot with my thumb while turning the pivot screw.
Lastly, if anyone thinks that the RHK has the feel of something like a production Spyderco or Kershaw, I think you are sadly mistaken. My XM-18 is put together so well its crazy. Its also crazy smooth, and locks up like a bank vault with no play in any direction.