So whats the skinny? ,but how does it render? Compared to 5 Infinite? Stable? Have they fixed the leaks? I have thrown my hands up with Vue 5I ages ago,but it is a damn fine program if they got it fixed:D

I haven't had any issues with it, but I'm a lightweight users still.

Ecosystem painting though is a HUGE improvement though, and allows me to get scenes exactly the way I invision them as opposed to being satisfied with percentages and weighted placement settings.

I gave up on V5I because of the ned for gray scale maps to place things where I wanted, rather then where vue wanted, but ecopainting and plant painting resolved that quite handily.

It's too early for a final verdict, it's still a pre release, not the finished product yet. It is quite stable, a lot more stable than Vue5 when it was just released. There are still issues ( radiosity, hypervue),  and  memory leaks are being eradicated with every new update.
It renders faster than Vue5 if you don't use the new spectral atmospheres ( but you will want to use them!), the new fantastic area lights, and texture filtering ( smoothes out the render, avoiding the hard edges we had in previous versions)
Radiosity (while acting a little strangely right now) is so much faster than before.
Many many improvements and new functions, it's an incredibly powerful program.

The only real issue I've had is the "save" problem but other than that I'd say it's the best thing yet!! My latest image was done with Vue6 if you want to check that out in my gallery!

Personally I think it rocks and agree with everything said above!

I've had issues with files not saving too, but the new features are worth every bit of beta testing - I would never go back to Vue 5 Infinite. 

It's a great upgrade with many bugs and problems. 

Who knows when the majority of them will be squashed.

It is worth upgrade if you don't mind the bugs.

The animation features alone are well worth it.

I'm still using vue 5 & vue 6 depending on which bugs I am trying to avoid.

I doubt you'd regret the upgrade to Vue 6i. Like Bruno said, it's already more stable than Vue 5i was at its release. And the bug squashing is still going on in this pre-release.

Lots of wonderful new features and improvements. 

VI6 is a big improvement, its only crashed once on me, even if looks like its going to crash it seems to recover(menu bar used to white in 5, you know it had crashed, still does that in 6, but if you wait it recovers). Poser imports fine, tne new cloud systems are great. One thing they could have done is give us rivers.

I like it except for Poser importing( Vue 6 infinite is slow and freeze with many Poser files).But it is a prerelease so ...may be it will be corrected because Vue5I  was good with Poser files

im with everyone else here, it´s already far better then v5i and i could never go back, however my final verdict will have to wait ´til the app is released for real but even in it´s pre release shape it´s much better then v5i.

e-onsoftware is on the right track.  There are lots of improvements everywhere you look in the program. It's still a little rough in some places.

I'm quite happy. There are some bugs to fix, but I've been able to create and render scenes that would bring down V5I to its knees with an OOM. Long live 64 bit!
It's faster. I can't say it's more stable than V5I in it's initial release - I immediately updated V5I after buying.
Poser import is still a problem. But they're working on it - I sent a ticket and within 24 hours I got a mail back saying they had received the ticket and that it was passed on to the developers.
e-on also said they had a high number of bug reports to work on, so it could take a while. 
Well, it's a prerelease, I expect the final release to be stabler.

In short, I'm happy that I upgraded. But I haven't ditched V5I yet, at this time it's a very useful intermediate stage: import Poser scenes in V5I, run SkinVue2 (SkinVue6 doesn't work on my system), save as .VOB, load in V6I. Works for me.