tesla bms module

Hi, For a 2s2p setup of 4 Tesla modules, I'm contemplating using a ZEVA bms system / soc display: http://zeva.com.au/index.php?product=112 http://zeva.com.au/index.php?product=128 http://zeva.com.au/index.php?product=119 Does anyone have experience with these systems? Or other good off the...