Pultruded arrows are made with an older process. While they are thin, straight, consistant and durable, they do have a couple of drawbacks.
One - the shaft wall is not strong enough to take the pressure of INserts. The nock has to fit over the shaft, not inside of it. This can create contact problems if you are using a drop away rest. The points are attached by means of an outsert or by gluing in a special insert. You can get "G nock adaptors" but these are pretty hard to come by. These are also outserts, but they let you use G nocks and one line of the Turbo Nocks.
Two - damage is often not easily seen. The arrows can split but still look ok to a casual glance. Len @ Macotech keeps a damaged arrow that looks ok to show how to check the arrow. His arrow looks ok until you grasp it at both ends and give it a little twist. Then the damage is apparent and you need to dispose of that arrow. This is probably not a problem most of the time, but if you hit anything solid you need to check your arrows. I have several thousand shots on mine with no problems.

Most of the arrows available now are "carbon wrapped" which is a different manufactureing process. They don't seem to be as consistent unless you get the higher priced arrows. The carbon wrapping gives a stronger shaft wall that can withstand the outward pressure of inserts.

I haven't shot the Cabela's pultruded arrows, but they are very inexpensive. If they are like the Bemans, they may be a good value.

There is a little more about them at the beman site http://www.beman.com/shafts/carbon-hunter.tpl

Good luck
Allen