My system uses two 24 volt 100 amp the Overkill Solar BMS which is the JBD BMS with some minor tweaks. If the unit fails it will be replaced at no charge. I have been very pleased with the BMS. Currently they offer a 120 amp version for 12 VDC.
The JK BMS is interesting as mentioned. It also has versions with active balancing which is a plus. There are several threads on the BMS and I understand there is a 12 VDC version as well. From what I read it seems to be still in development in some respects as software goes, but would certainly look at it if looking for a new BMS. I think in time it maybe the BMS to go with.