Glia,
Haven't compared the two but can attest to Twc's comments about the parallel SETs.
A little history . . . after picking up the Zu Tones for my work office, I fell in love with the single driver sound and wanted to replicate the same in my home office.
Accordingly, I picked up the Micropure Kotaros (single 4" driver w/ Murata supertweeter) which is akin to the Zu concept, albeit, with a deliberately resonant cabinet. These have very little bass are paired with a REL sub. Like Twc, I picked up a pair of Triode Corp M300SEs (20W / channel). This is a wonderful pairing and I believe the two make a really nice second system.
If you get an oppurtunity, check the Triodes out. Again like Twc, I started with (and still have) a convential SS multi-driver (Focus Audio FS-888 & Audia Flight) system and it is wonderful in its own rite. That said, ever since the single driver bug bit, I find myself listening to the "1st" system less than before. It's a real blessing to have and enjoy two very different systems - keeps things interesting and is lots of fun.
YMMV.
Good luck with your search.
Cheers,
Garry