I think the earlier failures were due to stitching the fabric together. The tiny holes created would stretch and eventually fail under load. Seam sealing helped but did not prevent the problem. I believe all manufacturers have now switched to either taping or bonding the seams. Bonded seams are the strongest; however, I have not head of any failures using either method. Like silnylon, CF is available in different thicknesses. Most shelters are made with either .51 oz. or .74 oz. I've owned 2 shelters made with .74 and would have no problem recommending it.
Advantages of CF over Silnylon include (for shelter material):
1) It does not stretch, once your shelter is setup you don't have to continue to retention like silnylon
2) Its truly waterproof, you will not get "misting" effect in rain like silnylon
3) Better UV resistance, I've retired a few silnylon shelters due to this
4) Lower weight.
5) Easier to field repair, can use most any type of tape.
1) Less abrasion resistance, silnylon much better. This of course is less of an issue for shelters.
2) Costs, yep way more expensive