Why do I get the feeling that most of these reviews seem to be given by those who have barely had any experience with the blades?
First some POV on some earlier statements:
1: don't take the view of a high-level player who, for the past 10 years has spent 40 hours per week training with just one particular set-up. They, naturally won't like anything new. You shall get a biased answer.
2: BTY's spiel on why they are so expensive is that the fibers are so stiff that they needed to buy very expensive cutting machines. It seems that they want to recover the cost from the profits on these 2 blades rather than subsidizing from other product lines.
3: Even if we believe their story, bottom line is that the blades are expensive to us.
4: cost should not factor in the review as to some of us, the price differential is insignificant in the grand scheme of things.
5: regarding Mizutani's personal choice, we just don't know anything other than the handle. He is Japanese & a important BTY tester. Most likely, his blade is bespoke.
While for the past 6 months, MJ-SZLC has been both my main & back-up blade, I have spent 6 weeks with the ZJK-SZLC earlier as well.
You cannot compare this blade to 5-ply wood blades. Different market. To me, I get more spin using Virtuoso on soft strokes but less on hard strokes than a Viscaria. I get more spinny using Acoustic than V- on hard strokes but I find better feeling & perhaps dwell using ALC blade at that power level. Soft core in V- seems to kill spin when penetrated well.
Other than brief trials of V-, V+ & Acoustic, my last 4 blades used were (in order): Barwell Fleet, TB-ALC, MJ-ZLC & the MJ-SZLC. I agree with Dan that these (2 types of SZLC) blades are a step up from the ALC blades. To me, they have more control in the manner that I need it: the bigger sweet spot, increased stiffNess & better feedback more than make up for the extra bounciness. Only the BF has better control of these 4 blades.
I found the Maze to be flexier & more 'carbony' than the TB-ALC (perhaps slightly different ALC mix. Likewise, I find TB-ALC to be more carbony than the MJ-SZLC.
I can spin more with the MJ-SZLC with just a short stroke over a wider range of strokes.
I prefer MJ-SZLC in short game due to its better feedback & increased stiffness.
The ZJK-SZLC has better control but is lower throw & takes more effort to use from mid-distance. I think that Dan had the same observations (relative to the TB-ALC) in his review. The MJ-SZLC is softer & had more spin.
MJ-ZLC is more difficult for me to use than the TB-ALC & MJ-SZLC due to it having a smaller sweetspot & it being flexier.
The professional players' TB-ALC & Viscaria blades are more like the MJ-SZLC in that they are stiffer, more powerful & have a bigger sweetspot than ordinary TB-ALC (most pros use very heavy versions of these blades).