Easily the best all-round SIB out there in terms of ticking more of the 'SIB advantage over RIB' boxes than any other SIB but out on the water a SR4 will still out perform it of course.
My thoughts here:
And in the sticky at top of this forum.
They are not that rare, you should find one easily enough in the close season.
Newer the better probably as glue can fail on older Zodiacs but as ever check over carefully, especially the seams on the floor, transom/fabric joins, look for the well known issue of seat mounts wearing against the tube (very easy prevention).
Just look for an obviously well cared for one and you won't go far wrong.