Not a club review, but....
Gonna throw this out there for those that may be 'looking for' such a thing......
https://www.hirekogolf.com/sk-fiber-tour-90-hl-steel-iron-shaft-r-s-flex.html
(They did have a special package for them and were cheaper than now. iirc, $89 for a set.)
Only played 1 round so far with them, but they seem to be as good as any steel shafts. Weights were very consistent, iirc, only 2g. diff in 9 shafts. And right on that 105 # for the most part.
They do seem to be tip soft, high launching. I played them trimmed to S and they are a soft S, imo. Very similar to what I find in the KBS shafts that come in most OEM irons now.
No complaints.
Just another choice.