Not sure why this is rated so high, as how often are you really Couping enemies that this becomes worthwhile, anyways? Plus, I've always seen this as a deadly precedent for your DM to pick it up on a BBEG to off characters that much faster, which seems like a bad exchange, if you ask me.
It depends on what your Int is compared to your Dex. Yeah, usually your Dex should be a more important secondary than Int for a generally melee character but some Warblades, like a Sharakim Warblade, has more Str and Int than Dex and can thus have double a good stat rather than a good + mediocre stat.Insightful Reflexes – Actually, since you already add Int to Reflex saves, this just makes your Reflex save worse.