I lectured Frank Oropeza about rectifier type isolators back in 1982. Sure Power and just about everyone else selected 35 ampere 50 PIV 1/2" press fit rectifiers. Pure garbage. Bottom of the barrel. He decided on 50 amp 200 PIV rectifiers. And had few if any warranties. When social butterfly Steven Scheidler took over Sure Power from his father Ralph (the founder and brains) he started bleeding quality for profit. Thank God the battery separators were designed exclusively for Essex or White Rogers relays.
Regardless only a few companies use good rectifiers in diode based isolators. If Blue Seas has a diode based isolator it most probably has good rectifiers.
A White Rogers or Essex relay is tp say conservatively 1000% tougher than metal can trash.I still have 7 or 8 new 200 amp mercury filled relays. The pick of the litter.