Does anyone have experience with the products at fibraplex.com?
A bit of reading online suggests they aren't quite as robust as aluminium, but the majority of failures are caused by user error (failing to ensure the pole sections are fully inserted into each other).
I've been looking at getting the weight of my Mutha Hubba down, and replacing the 1kg pole set with 500g Carbon poles. The dilemma is that for the same price of replacing my carbon poles I could probably get a Tarptent, but I really really love the build quality of the MSR. If I could get the 3kg weight down to 2.5kg, then it would be a much more acceptable weight to split two ways.
They do replacement light weight pole sets for many common light weight hiking tents.
I might replace the two not-quite-so-critical straight pole sections first before going to the expense of replacing the main hubbed pole.