I'd be the first one to agree that there may be better ways to take care of our batteries than what's available, but it's what we got and, for the most part, at least in those with multi stage charging systems, they can do a great job. And, if those that disagree could make a more viable suggestion, rather than just copmplaining and telling us how bad it is, that too would be very benificial to all.
It's like my Chevy Blazer TV, it works great for me. Would a more expensive Mercedes-Benz Diesel SUV vehicle do the job better? No doubt it would, but I don't see a need to bad mouth the real or imagined inadequacies of my TV of choice just because something better exisits. As I have been known to say; "It's good enough".
I didn't comment on the other device because it appears to do nothing more than our existing RV converters with multi stage chargers can do, and it isn't a converter in addition to being a charger, and for about the same price as a PD9000 series converter/smart charger.
I don't know if placing a 2 amp load (much the same as a light
bulb) on a battery 24/7 will keep some of those older converter/chargers from frying or boiling a battery. But if it did, I would suggest a few $$ for a light
But, if someone is plugged in for "Long Term" what ever that means in terms days, weeks or months, do they even need a battery? And how many on this site meet that criteria.
I am often critical of many of these "Save the World" type gadgets only because so few of them really work or, if they do work, are not worth the cost.
FWIW: Although there are still nay sayers out there, my Hunter, with it's PD-4045 and a two year old Interstate group 27 battery, has been plugged in 24/7 since last February. It might be down 1 oz in electrolyte, and, as always, shows a full charge. Spending another $40 just to put a load on the battery doesn't make sense to me at all.....
In summary: IF this device does what is claimed, it could have some value to those that are primarily plugged in all the time and don't have a multi-stage charger on their battery. But I don't see that it is designed to provide any protection against overcharging or boiling of the battery.