I corresponded with Patrick yesterday. He told me that Castle should soon be releasing a firmware version that is optimal for the KDE motors. Some folks are already testing this firmware, and the results seem to be positive. So, it seems that Castle ESC's and KDE motors make a good combination, so maybe a good reason to go with the KDE motor.
I discussed with Castle the process of exchanging an ICE series for a similar sized EDGE series at a discount. They told me that Castle completely discontinued the ICE series, and they no longer have a single ICE ESC to exchange. Therefore, if you send the ICE ESC for repair, all they would do is send you back an EDGE controller by default. The cost of exchanging an ICE2 160HV (regardless of whether it works or not) for an EDGE 160HV is $155.00. They also told me that this is not a limited time offer. So, I plan to exchange most of my other ICE controllers once the flying season is over during the Winter.
BTW, the ICE2 160HV had 470uF capacitors. The EDGE 160HV has 680uF capacitors.