Yiu cannot predict how a soeaker will sound based on orice, spec sheet, brand, or even the anechoic frequency response. That's why all my reviews posted over at the S&V forum include a dozen measurements, both anechoic and in-room, and written impressions based on the same music tracks each time. Most of the serious enthusiasts have made their own cooy of my speaker auditioning CD and understand what to listen to in each track so they can compare my impressions to what they hear themselves. There is a thread about my audition CD at S&V as well... I need to copy it over here.
But... I chose the Morel Supreme tweeter for my DIY soeakers because at that time I considered it the best oerforming and best sounding direct radiating tweeter available. To make that determination I actually purchased nearly a dozen top end tweeters and measured & auditioned them myself. However, I am less impressed with Morel's Supreme Woifer, though I like the Supreme midrange. To fully enjoy the midrange yoy need a three way system with woofer along with the midrange.
I have not heard these speakers, but so much of the sound is dependent on the crossover. The best tweeters and woofers on the planet won't sound good without a great crossover. Great crossover designs are far more than expensive parts and some trendy network type. Linkwitz-Riley is not always ideak, and it is more than a calculated value. Crossovers are like gourmet food, you cand take incredible ingredients and follow a recipe to the letter, but it won't taste the same as what a brilliant chef can create. You have tweak the spices to the actual ingredients in front of you. You have to tske into account the other stuff on the plate. Etc. With crossovers something as seemingly minor as lowering the relative tweeter level by 1dB could make all the difference in the world. Sometimes shifting the woofer's f3 down by 3% can turn a good sounding midrange tone and detail int the absolute best tome and detail any has ever heard. My point is this: the crossover is the key, the most critcal factor of any loudspeaker system. If it isn't done right and to YOUR tastes, it won't matter which drivers are used. You have listen to the system to know.