I think most of us here have good reviews, and most if not all of us stand behind our product.
We all have our preferances. My favorite material is BCY-X, 18-20 strands, for a moderate (not tiny, not fat) diameter string. On my bows (including a Samick Journey) it's quiet, consistent, and stable.
I haven't seen any reports to confirm or deny a particular string material making a bow last longer.
In my personal experience, I've broken a lot more bows while they had a Dacron string on them than any other, but I don't blame the string material.
I have one bow that I bought new a good 15 or more years ago that's never had a Dacron string on it and it's still going strong--draw weight hasn't changed, no sign of wear from the string. It's been used and abused--had it refinished twice--but no string damage.
The Journey has had a BCY-X string on it for going on two years, been shot a lot. I draw around 31" and am shooting arrows that weigh less than 9 gpp. So far, so good--no signs of wear or damage from the string. Taking it bowfishing for stingray next month.
Chad