OK...ONE LAST SPEAKER QUESTION cash cash

Warren's right. You can drive yourself crazy worrying that there might be something better available or you can enjoy what you have. If you have to jump in cold on one of these speakers, I think it makes sense to choose the one that has a money back return policy. Even if you pay round trip freight on the Defs, it won't approach the price of an airplane seat and a hotel room. And where will you get the more complete audition, in your own room with your own gear for 60 days or during a couple of hours listening to completely different ancillaries in a strange place with a salesman yammering in your ear about what Miles Astor says?
Soon you'll be promoting Zu like the rest of us.

You do have to pay for the Zu's up front but you can use a credit card to delay payment a while.
As you noticed, there are NEVER any Zu Definitions for sale used. This means two things to you. First, they should be a very quick resale and second, they should fetch a very high percentage of new price when sold used.
I also want to note that they are not resold or returned because they are so good. The Db-99 is frequently resold according to the above poster and there may be a similar conclusion drawn from that fact.

Tvad,
I'll concede all your points. My statement was a bit too spontaneous.
I'm a Zu owner, however, so I know which way to bet on this one.

Tvad,
I still have Druids. I've tried repeatedly to convince myself to upgrade to the Defs and so far it's been a no go. Last week I took delivery of Zu's new Mini Method sub and I'm wondering if I even needed that. The Druid is pretty complete by itself. I'm going to keep the sub for my 2 channel movie watching but it is not so necessary with music.
Yes, I still use the SP-3 with my Druids but I alternate another combo that works rather well. Today I have a Pass Aleph 30 and an Eastern Electric Mini Max preamp driving them. I think the latter combo has somewhat higher resolution but there is something about the SP-3 that is very hard to abandon - and surprisingly the bass is pretty equal. That fact really surprised me.
As for waiting to see what else Zu will make in the future, why? Are you going to walk until you are convinced that Ford or Toyota or whoever has finalized the automobile.
You remind me of myself not buying a computer until fairly late in its development because I noticed that they got bigger and better and cheaper every year. While I was making up my mind, everybody else was benefitting from computer use and I was on the sidelines strategizing. Well, I've had a computer now for 7 years, in fact I've bought 5 of them now, and nothing has changed at all. They still get bigger and better and cheaper every year but at least now I can participate.
You all sound like kids at the candy counter with just one nickel. It ain't that hard to make up your mind. Furthermore I will say that I have bought probably 40 or 50 pairs of speakers in my time and never really regretted any of them.
The reason people rave about Zu is simple. Don't complicate it.

Just received Zu Definition Pro speakers a couple of days ago. They got the standard factory burn-in but I am sure they are not broken in fully as yet. Performance fresh out of the box is unprecedented. I thought my Druids represented an extreme in resolution but these are very clearly better. Zu has rewritten the book with this product.

I'm driving my Def Pros with a Red Wine Clari-T on top and a Pass Aleph 30 on the woofers. Very nice. Yesterday I ordered Vinnie's Signature 30 amp which I expect to be a giant improvement. Apparently I'm not the only one who knows about this new unit. It's only been available for a few weeks and there is already a waiting list.
As for your VAC amp, I'd have to guess it is pretty near the ideal product to be driving Definitions. I have no experience with it myself but I can recall universal rave reviews running for years on that amp with the only limitation being power output which should certainly not be a problem with your new speakers. Congratulations.