A neighbour bought one. Looks pretty good to me.
There were quite a few MKXs around and they were glorified Edges, so I don't see the commonality being that big a deal considering the price overlap. If it was more expensive, then there may be more of an issue.
The SRX has been pretty successful inspite of sharing the same platform with the Terrain/Equinox. Most people wouldn't even realize they share a platform. The same with MDX/Pilot, RX350/Highlander etc etc. In fact the RX and SRX are usually at the top of their class in terms of sales.