I've been working with CS5 and the 15 day demo of VIVEZA 2 for a week now since returning from Moab. First off I'm one of those weird photographer that run a PC (I can think of one other slightly weird guy - Ken maybe that's why we get along so well). I've now loaded CS5 on both my large studio computer as well as the large laptop; additionally I've loaded the free 15-day trial on the studio computer and after the first hour or two decided to buy the program. All in all I've now processed several gigs of images using both programs with no problems.
Both computers are running in 64bit mode and so far I only have the 15-day trial loaded on the larger studio computer a Dell 690 quad core with 24 GB RAM. I'm also using dual video cards with a total of 4 monitors hooked up (yeah it kind of looks like a star wars thing). All this might appear to be excessive however I am a landscape photographer that routinely works with multiple gig image files.
So far no major problems. I haven't had any freezes and when I loaded VIVEZA 2 it showed up immediately in both CS4 and CS5 (both 64 bit). The program works well and plays well with CS5 on my machine.
The only slight problem I have which isn't the fault of either software program is a small bottleneck in response time since I upgraded my main working monitor to a Dell 3008WFP. I replaced one graphics card with a Nvida 295 which works well however I think I'm encountering a conflict between the 295 and the older 285 so I'm replacing the 285 so both cards are the same.
I'm still running VISTA 64bit on the large computer but intent to upgrade to Win 7 next month; I upgraded the laptop (Dell M6400) from VISTA 64 to Win 7 (64) shortly before I installed CS5 and feel it is now running faster and appears to be very stable (although I never had a problem before).
I don't run LR as I just never have liked it that much which is I guess a personal preference.
And before I forget to add - during this week of processing I've also occasionally been running C1 at the same time as CS5 without any hiccups. I just finished processing images for my latest blog entry on Arches National Park.
The best new tool in the CS5 kit has got to be hands down the content awareness tool for cleaning and just about anything else. There's more to CS5 and I know I've only scratched the surface of this upgrade.