It's one of the last versions of Scubapro's original stab jacket before they switched to the Finseal and generally moved away from the original single bladder design using double taped seams and very tough fabric.
They were super tough and while I have never heard of the fabric degrading on the inside - the fabric is basically a nylon layer calendered to a layer of butyl rubber - they do have a known issue with developing seam leaks after a decade or two of heavy use.
In terms of utility, if it looks looks like it is in good condition with no fraying seam tape it is probably in good conditiion and has several more years of use left in it. The value is harder to set. To some people it is just an older BC with less flash and style than current offerings, while to those who have used it, it is an excellent, stable BC that in many ways was a peak in BC design before all the flashy but generally useless add ons by the marketing pukes degraded the basic design.
I will probably stick with a BP/wing until I die (I started diving with a Scubapro Bouyancy control pack, one of the original wings, dove it until I wore it out and then used a Scubapro stab jacket until wings were available again) but if I went back to a BC, I'd look for one exactly like the one you are considering.
I have on occassion repaired them by using neoprene cement applied to the inside of the seams with a long piece of stiff plastic tubing to work through the inflator and OPV holes in the BC. It is a lot of work but it produces an effective but still neat looking repair.
