Zu vs. Tekton? -- your comparisons on price, build, sound

My brother in law just bought a pair of Zu Soul Supreme speakers to go with his Rogue RP7/First Watt J2 combo. 

He's clearly chasing that lower watt/higher sensitivity magic.  

I've asked him about his interest in Devore, AudioNote and some other pricier, high sensitivity speakers, and they're just not coming up used at a price he wants to buy. 

So, he's going with Zu.

Zu and Tekton are in the same price region. How do their similarly priced models compare?

If you have researched Zu and Tekton and compared similar priced models:

What differences in your system did you notice in their sound?

How would you compare their build quality — cabinets, drivers, etc.?