I have some MSR carbon fiber poles and they have held up to some rough use for three years now. I like them a lot. They help me travel faster and the extra stability has, I'm sure, saved at least one twisted ankle. I use them to pitch my Squall 2 Tarp Tent so they have dual use.

They only drawbacks that I can see with the cheaper poles is that they are most likely heavier. I don't know the specs on your poles, but I am judging from trends I've noticed when I was initially shopping for mine. As with most things in commercial backpacking gear - the lighter the more expensive.
The other drawback has to do with durability. If it breaks on the trail you now have something that is of little use if they are not repairable, and something you will then have to carry out with you; useless weight.

Cheap poles are not a bad idea for trial trail use though.