I've owned a few jspec sets, Miura blades, Srixonzr 600, TS z101, as well as a set of fourteen, Vega and some TM endo forged heads.
The aesthetics of the Jspec equipment is off the charts, absolutely beautiful. I suppose spec wise they we better than some sets but still not perfect. It's beautiful stuff, but you pay. A cheaper head like say KZG might offer a 1/2 way point between the run of the mill stuff we see every day and the bling of jspec. I've enjoyed my many sets of KZG.