Tho' the thread is a few months old, I just thought I would add my 'tuppence' worth ...
I know of fellow modelers who have had 'carbon' undercarriages from 'Carbon Copy' failing on heavy/bumpy landings. On inspection the layers of fibres were delaminating at the stress points where the bend is as it curves away from the mounting plate to the leg itself, and as mentioned in an earlier post this also was in fact a 'sandwich' of a single layer of carbon fibre top and bottom, with ordinary glass fibre sandwiched in between. This wasnt obvious to the eye untill it delaminanated, and we pulled apart the laminations. At first glance when new it appeared to be solid carbon which it obviously is not, so beware !! they were sold as 'Carbon' with a 'carbon' price tag ! Possibly they may have put this right by now, I dont know, as I refuse to have one from them, but would be worth checking out with them if they are 'solid' carbon first as it cost my mate a time consuming model repair job when his undercarriage failed.
I fly 100cc + size models with 'solid' carbon undercarriages that came with the kits, and never had one fail ... yet. As someone mentioned earlier probably one would have to pile in and destroy the model before the 'solid' carbon undercarriage would break !! ( but i'm not about to test that theory in a hurry lol )
Regards.