I would guess the same weaknesses of the DeVores (If you feel they exist):
1. Very sensitive: Any noise in your system will be more apparent.
2. Revealing: Any changes like interconnects will reveal differences more, poor recordings will sound poor, great recordings will sound great
3. Myself, never enough bass. Unless one gets a speaker with a big honkin' 12-15 woofer, I will always want more bass. That is why I run a sub. I could have $100,000+ Wilsons and would add a sub. It's not just a ZU thing.