Well we've had one instance of the C-ABS fault to deal with that was rectified by replacing the front modulator. The bike was still in warranty and Honda picked up the bill. We have sold many C-ABS Blades and only had this one instance, however it was a reason along with the complicated bleed procedure that made me opt for a non ABS version for sure.
No official line that I know of but if a fault appears whilst still in the warranty period then I've not personally had any problems with Honda covering it. A lot of it depends on how the claim is handled and reported to Honda.
VTR1000SP2 CBR1000RRC RVF400RR CBF500A CBR600F4i CBR400RRL Z125Monkey