Guest Battery Chargers

[Mike and Joanne Stimmler]

Is anyone familiar with the Guest 2620a Charge Pro? It is a 2 bank 20 amp charger and This is the charger that was on my boat when I bought it . I am in the process of replacing my batteries and it seems that this charger has been doing a pretty good job so far but I am considering the Xantrex,

Any thoughts?
Mike

[Stu Jackson]

Mike, doesn't look too bad, but has limitations for long term battery life. 

See: http://www.marinco.biz/files/Guest%202009.A%20catalog.pdf  See page 4.  I got here by Googling the name & model #. 

Looks like a good 3 stage charger to me, except that there appears to be no equalization settings.  Also, Guest's discussion and wiring diagrams using isolators scares me, since isolators take 0.7 V to 1.0 V OUT of the system and are way old technology.