I haven't heard the VS DB99s. And specs seem sketchy.
Ok?
A little preamble: The DB99 is described as a 3-way, implying that it uses passive crossover elements in the signal path to all the drivers. If this is true, it would likely be the primary weakness compared to the Definition.
Based on your first quote that's nothing more then an assumption which holds no merit in the real world. I don't care what speakers you like or don't like, but don't say you don't like something you've never listened to - that just screams narrow mindedness.
What I can see about the VS online does not give me confidence it can achieve the holistic sound of Zu that is vital to me, but I'd have to know more and hear them to be sure.
I agree with your last statement, but I am at a loss of what more you could want to learn from the website that you could learn about the Definition's on Zu's website?
I have never heard the Definitions so I have no observations on there performance, but based on the information on their website the specs seems sketchy - see what I mean ;)