Could it be the best, most versatile Crisis Suit configuration?
Think about it. Strength 7, 36” range. AP4 leaves much to be desired but with the two shots you get per pod, your rate of fire will make up for this. I believe what makes this configuration the best is that it plays to the Tau’s strength. It has range so you can keep your distance without losing rate of fire, unlike the plasma rifle. There is something about being armed with plasma rifle that makes you want to close in and move your troops closer to get that extra shot, even though this can often spell doom for that unit. With the Missile Pod, you can confidently move away from the enemy and maintain the same rate of fire.
Its range is also a bonus if you decide to deep strike your suits. With 36 inches, you can land a safe distance away and not have to worry about deviating out of range.
Its high strength of 7 makes it a no brainer. Rhinos, Chimeras, Wave Serpents beware! Here come 6 missiles flying at you. Although I’ve been away from the tabletop a bit lately, I know all those monstrous creatures are popping up with the new Codex: Tyranids. For the most part your going to be rolling 2s and 3s to wound. That coupled with twin-linked, you’re going to be putting lots of wounds on thing. Sure your opponents going to get his armor save, but we all know that when you roll dice, bad things happen.
Then there is the cost. Armed with twin-linked missile pods and a flamer (that's how I roll), each suit comes at the discounted price of 47 points vs. the 62 you'll pay for a Fireknife (which is BS3 mind you). A squad of 3 comes in a 141 points. Not bad, not bad at all.
Over the past year or so of always fielding at least one unit of Deathrains, I’ve found them to be versatile and deadly. To my surprise, they often cause more damage than my Fireknives.