Gotta say with my smooth tempo I’m a huge fan. Enough that if I were to get another set of irons I’d be sure to get fit. We had a guy drop off his i500 irons with xp95 shafts in regular flex a few weeks ago. I hit them on the GCQuad launch monitor and was piping them. Launch was actually lower than with stiff, perfect height and decent angle, felt ultra smooth and I could feel the kick. Ball went forever. Today I hit my pro’s set of Mavrik irons he picked up at the golf expo… same xp95 r300 shafts. I took 2 swings and just love the kick. Took a normal swing and got 9 mph more ball speed and all the other numbers were perfect. Spin was a bit on the low side but I expected that, no worries.
You can’t just go by clubhead speed when choosing shaft flex.