If you have a captain that can do it, take DE AND IFHE and you will only have a base loss of 1%, if you want to maximize damage. Toss in the India X-Ray and you've dropped the overall chance to .5% to 0%, depending on gun caliber.
Since cata fighter on CA's was not nerfed to hell, I find the Direction Center skill very useful on my CA's. So pretty much, any CA that can use a cata fighter, get's DC, and ones that cannot, get Preventative Maintenance.
As for Priority Target, I just don't see that skill super useful to me. I won't argue that the little bit of extra information is useful (being targeted), but since I ALWAYS assume that I'm being targeted the moment I get "DETECTED" popping up on my HUD, it's a waste of a skill point for me.