I use the BIC in my jets, I have a BMS to use with another jet that already has much of the BIC stuff built into the Rx. The BIC is a switch in itself, the external switch is just an option. The BIC is superb.

BIC and BMS are different things, not an old and a new version of the same thing. BIC is a switch with a regulator, two battery inputs but one output albeit with a twin lead. Thus in the BIC there is a commoning of the circuit. A 2-channel BMS has two totally separate circuits with no electrical common between them, so two inputs and two outputs, no switch, no regulator. I will be using one BMS channel to monitor the main battery input into the rx that has its own regulator and redundancy arrangement, and the other BMS channel to monitor the reheat LED lipo.

I had that in my small F-4 John, it's an excellent device.
I really like Emcotec stuff.