Hi Rob,
I'm leery to give any advice here, especially after Prowse's last review but it was made after my install. Here's my experience....we swapped out for 2 Epoch 300ah essentials 2 months ago at Quartzsite (installed myself...with a little help from my friends), loaded the app, installed a Victron dc to dc charger. All has been working as advertised and I could not be happier with the result. Both batteries charge fully and equally on solar and on A/C through the Xantrex 2000 W inverter. After all is said, I would be hesitant as you are and I don't know how I would have proceeded had that review been posted before my install. In retrospect my install went great and maybe I was just lucky or the review doesn't apply to my 300ah batteries, just the larger ones. I do not plan to perform any type of software upgrades in the future...even if deemed safe to do so.