ST-X 230

Independent commentary noted the chassis offers "noticeable forgiveness despite its ranking in Most Wanted Testing," with the unified sole composite and CORTECH Chamber working together to provide increased stability and consistency even on off-centre hits. Heel-biased weighting plus Beta Ti face and CORTECH Chamber preserve ball speeds on off-centre strikes. Robot testing placed the head in the bottom half of the field on raw forgiveness scoring. Solid mid-pack 2023 forgiveness for a draw-biased game-improvement chassis.

Cortech Chamber technology (stainless-steel weight + elastomeric TPU) provides 1-3mph ball speed gain with ~200rpm spin drop vs predecessor. Launch-monitor testing confirmed spin was lower than other standard heads as manufacturer suggested. The Beta Ti face maintains characteristics and resists micro fractures longer than commonly used 6-4 Ti. Solid distance for a higher-launch draw-bias chassis.

More workable than the predecessor — described as a mild draw bias with greater shape-tuning capability. Reviewer testing reported the driver played neutral to slightly draw biased at standard loft, with neutral characteristics emerging more strongly at lower loft settings. Workability vs draw bias is fitting-sensitive — shaft choice influences how strongly the chassis imposes the heel-CG bias. Better than typical draw heads; below dedicated tour heads.

Reviewer testing called the feel "distinctly Mizuno: solid with a nice explosiveness," with "impact tone delivers a solid, confidence-inspiring crack, while vibration dampening produces smooth feedback." Off-centre strikes feel dull in the hands — strong centre-vs-miss differentiation. Robot-panel testing rated feel below other heads in the family. Mid-pack 2023 feel; below the brand's tour-spec heads.

Acoustic profile reads solid and muted without harsh pinging — a fairly sharp "thwack" sound. The carbon crown contributes to refined acoustics, eliminating hollow or tinny sound. Robot-panel testing rated the acoustic poorly relative to other heads. Centre-vs-miss differentiation is strong — off-centre strikes sound flat and dead. Acceptable but inconsistent reviewer reactions.

Address profile reads as a more rounded, deeper shape with weight located closer to the hosel — confidence-inspiring without telegraphing the heel bias. Modern design language with visible carbon crown. Some reviewer commentary called the silhouette "one of the best value drivers" with strong shelf appeal, while robot-panel testers rated the look below peers. Mixed reactions averaging out to mid-tier.