The knock on carbon poles is that they can break with sufficient shock from the side, rendering them useless for their intended purposes. Where aluminum is more likely to bend, allowing you to bend them back and finish your trip. The line is that carbon fiber is stronger along the grain, but brittle from the side.
Funny thing is though... I don't hear/read many comments about this actually happening and it doesn't seem to be curtailing the use of carbon fiber tent poles. My poles got wedged between rocks several times this spring while I was on the Ozark Trail and barely a scratch, let alone breakage. This was with my full weight on them down-hilling, with a 40 lb. pack. Much heavier than I normally hike with.
I can't speak as the "expert", as these are my first set of carbon fiber trekking poles. However, I'm thrilled so far. I've bent aluminum poles with less pressure/weight many times in the past. So long as I can get these in the $100 range, instead of full price, I think they are a no-brainer. My only worry is that I might eventually have to face a windy night with a duct tape splinted pole steadying my tent. Worst case scenario... there are usually some tree branches available to me, if needed.