For me it was an obvious choice as a) I already had DA Aqua Masters and Royal Aqua Masters on hand, and b) the Kraken wasn't even a twinkle in anyone's eye yet.
I started rebuilding US Divers double hose regulators in the 'dark years' when new old stock parts were not all that common, but before all the current new production parts were available. On the plus side it was fun running down leads at old dives shops and buying up the usable parts they had. On the negative side, some parts were still scarce as hens teeth. Things needed to add modern accessories, like banjo fittings, were similarly hard to find.
In that regard when the PRAM first came out it was great news and I quickly bought one and then sent a straight, but well worn set of cans from a 1957 DA off to get re-chromed and the end result was a "new" 1957/2007 PRAM with new silicone hoses, second stage diaphragm, mouthpiece, wagon wheels, and mushroom valves and customer labels. I added an HPR second stage later, along with the DBE when it became available.
Then, I built another one just like it from the next run of PRAMs for my wife. More recently I built a third on a round label DA with excellent original chrome.
Consequently, I now own three of them, in three different generations, 2 yoke and 1 DIN and I like them all. Two have VDH DSVs and I'm undecided on the third. I set it up with 1" EPDM hoses for my Hope Paige mouthpieces and have a RAM set up the same way.
In any event, the PRAM has become my go to recreational diving regulator doing everything other than cave and technical diving.
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The argument for the Kraken is an all new design and an all new regulator, which makes sense if you; a) don't already have a DA or RAM in very good condition; and/or b) don't mind paying the whole sticker price up front.
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If you like old Mustangs, I think you've answered your own question. Quite frankly in terms of performance the PRAM doesn't have anything to apologize for. Mechanically it will allow a cracking effort around .4" of water and the exhalation effort is around .5 " of water with a DBE and around .7" of water with a duckbill. Provided that you mount it properly on your back, the in water performance is on par with the average single hose regulator, although it's much more position sensitive.