In a front line star or Keshik a Sphinx is most likely going to be paired with a Nova Cat, which while slower most configs are heavily geared toward long range combat. The two work very well together. One could almost go so far as to say that it's on purpose. :D Woe to the poor soul who finds themselves facing such a star in an environment were a Nova Cat D would be ideal.
It may lack finesse, it may be boring, but it's hard to argue that the Sphinx isn't brutally affective inside 15 hexes. It's a welcome addition to the Cat's touman and the anchor of many a star I've built. Since some of the previous discussions have abandoned all pretext of zellbrigen, imagine a Shadow Cats dropping off a point of LB-X equipped Thunderbird BA in range to finish off someone a Sphinx has had a turn or two to mess with. {>{>
Sorry, where was I?