My .02 cents....
I believe every ounce of the power gained to be true of the dyno chart that was posted by K&N testing the 2014 truck intake. 10rhwp is not a lot but thats a common gain from CAI kits. Is it worth it... depends on whose buying. I was apart of testing several CAI kits(K&N, Airaid, VaraRam, MAC, Steeda and possibly more that i'm forgetting) on domestic applications over the 8 years I worked at a performance shop(gm specialist) and I don't recall one cold air intake not making any gains in power. We did test the infamous "Tornado" piece of crap and that vehicle lost power. Why... cause it was choking the air path. We tested what we sold and we also used on our personal vehicles those that we sold cause they worked. Some might have performed better than others, sure. If given the choice of a metal tube vs plastic tube we always chose the plastic so it did not hold the heat. But when designed properly to draw in only cooler air from outside of the engine bay and is free flowing path why wouldn't it work? Also the oil type filters can be problematic IF not oiled properly(over oiled). There is a method to oiling them and it's quite easy. It's all I've ever used and have never had a problem what so ever. As for doing the tube vs whole intake its just like doing a muffler vs the whole catback. Gain some with partial and even more with a whole system. Just what a person cares to spend their money on. I'll be buying a whole system for sure!