I don't have any 25's left, ~P. I either sold, traded, or gave them all away.
I do remember them having rather stiff springs though. It doesn't matter much on the Easy-Opens however. They are of course, easy to open despite the stiff springs.
None of the 25's I had were so stiff that I couldn't get them open but the pen blade on a 25 Barlow I had wasn't far from it.
I would estimate that they run about an 8 on the pull scale in general.