Hi,
I don't know very well the Prism,
but among the rebreathers mostly used in the world my preference it goes to Megalodon and Ouroboros.
For an underwater expedition that will develop in 2007, after various reasonings with the other members of the team we have decided to choose the Megalodon.
This for it sturdiness, versatility, safety, and to the dimensions when get off. The respiraton is excellent, and its trim in very natural in water.
The ouroboros, is an exceptional units, I am discovering it endless potentialities day by day. Complete electronics, facility of respiraton, everything behind.
Stings weak for the use in our exepidiont that we will develop it on board of a boat, a certain fragility, the poor versatility (cylinders, first stadiums, accessories) and the dimensions of the units.
Inspiration and Evolution or Vision, are of the unities of a great reliability, with thousand of sold unity, hundreds of thousand diveseffected.
It is second me the easiest CCR to be taught to a person that arrive near to the world of the rebreathers. Great volumes, simplicity, reliabilities are some of its merits.
But for the experienced scuba diver after some time it becomes narrow, the great volumes encumber the movements and the sees, scarce versatility limits the use of it in the trips. Those people who keep on usually using modify it to the such point to make it unrecognizable,
I not share to 100% this choise
O2ptima is too soon to give a judgment, but also them the choice almost forced of the cylinders and the use of Extended Air, it will limit the choice of it for those people who intend travel with his CCR.
I hope to be you useful.
Regards
Aldo
