The big rave these days is lithium (and Bugatti charons, 1945 Chateau Lafitte Rothschild, pink flawless diamonds, white truffles, estate grown Darjeeling teas, etc)
But for ordinary folks the question seems to be: Yes or no, are the Lifeline batteries worth the extra cost?
In a nutshell, if a person is willing to take the extra time to observe the 20% MINIMUM STARTING OUT AMPERAGE rule in recharging, willing to not have the batteries sit for weeks and weeks partially charged, and every 6 months to a year discharge a floated battery then apply >20% charge rate then yes, the Lifeline is worth it. The reason is plate thickness.
Do Deka and Trojan manufacture their own AGM batteries in plant? This would mean East Penn manufacturing in Pennsylvania and Trojan in their two US plants...? I do not know. Do any of you know? For sure?
My own Lifelines are definitely not cycled daily or even weekly so they are not a valid reference.
But when open forums on sailboat cruisers who go years circumnavigating (off grid) and true off-grid homesteaders select Lifeline as being overwhelming # 1, the act is not lost on me.
Like my favorite example: My stupidity in trying to save money by buying DOUGLAS TIRES at Wal-Mart. Sometimes savings are a ripoff. The Michelins have outlasted three sets of DOUGLAS and still have >50% tread life remaining.
I would love to find -As good as Lifeline but at half the price- AGM batteries. Good luck. Something tells me my 31's will be alive and well at age twenty, if they are taken care of. Again they are mostly standby these days.
I just sprang for more costly 4.0 diopter reading glasses on eBay. They cost 4x the price of the cheapies. Are they worth it? The lenses are distortion free and I can now wear reading glasses for longer than 3 hours without getting a headache. You tell me if the twelve dollars readers are "worth it"?
Or if the Gates fan belt is worth double that of Continental or Dayco fan belts.
I simply do not have money to waste. Period. I paid six dollars for a three-step manual knife sharpener that in a nutshell is a terrible sharpener. Fifteen minutes sharpening a knife yields a semi-sharp edge. No way around it I wasted six dollars.
It would be nice to have an "average" income 800% greater than what it is. And a giant recycle bin out at the curb. Such is life.