Was reading up on solar and AGM on www.windsun.com and came across this:
"Concorde AGM has the lowest internal resistance of any commercial battery that we know of - only 2 percent in a new battery. In solar electric systems, this is the same as getting an extra 10 to 15% out of your panels."
IMHO, the following is one of the most important paragraphs contained within that excellent link you provided on AGM batteries (... not just the Concorde brand, but AGM battery technology in general):
"The AGM battery has an extremely low internal electrical resistance. This, combined with faster acid migration, allows the Concorde AGM batteries to deliver and absorb higher rates of amperage than any other sealed batteries during discharging and charging. In addition, AGM technology batteries can be charged at normal flooded lead-acid regulated charging voltages, therefore, it is not necessary to recalibrate charging systems or purchase special chargers. Concorde AGM batteries can be bulk charged at high rates without damage - up to 10 times as fast as most gelled cells, and 4 times as fast as flooded batteries."