Just finished my first round with the JPX 921 HMP. Enjoyed getting some distance back, and was able to get a feel for the ball flight on a course. I picked them up last Friday and hit 25 balls at the range. However, I was hitting off mats into a 15 mph headwind, so not much to consider other than feel (with range balls).
Today, they felt solid. They flew really straight. Really straight. I picked up a lot of the distance I've lost this year. I was able to hit the ball, for the most part, where I wanted. I typically play 2 deg flat on Mizs, so a pulls were attributed to "toe up" strikes. Oh yeah, before I forget, they fly really straight! Definitely a different tool if you want to bend it both ways. I was expecting high launchers, but that wasn't my experience. I typically play a lower ball, and was able to keep the ball flighted just how I wanted.
As for feel, I really liked them. I wasn't expecting super harsh, such as an old set of cast irons, or the buttery MP feel, but I was happy with the feedback to my hands. I can confidently state they felt better than i210s or i500s, which I was considering.
My favorite shot was on a par 3. 202 to a back pin, and wanted to play about 196. I grabbed the 4 iron, slightly flighted the ball and hit it exactly where I wanted. I was left about a 20 foot putt, what was more than can be expected on that particular hole.
Some background: I turned 52 this summer, I have an artificial disc in my S1-L5, and my left knee has needed knee replacement for several years, but I've been just gutting it out and putting off the inevitable. Well this year was great, as far as the amount of time I was able to play (thanks COVID), but was absolutely the most drastic, and difficult period asy far as physical limitations go. I was comfortably playing specific distances, and throughout the Spring to Summer, lost about 15-20 yards per club. My knees were a wreck and really took a toll on my swing.
I've played forged irons for a long time: MP 14s (10 years) then MP 32s (12 years), then Wilson FG V6/C300 forged set two years ago. This year has been rough on my distance (loss), so picking up a lot of lost yardage that was lost was fantastic. I get there's a trade off, feel vs distance etc. I don't need the left/right correction aspect of the HMP, but need the distance. As I'm only getting older (yes, it really does suck!), I find this new type of club (distance with smaller profile) is perfect for what I need.
One round in the bag - super happy.