Well, I'm certainly not criticizing VSL's general work, or samples at all.
I'm having too many issues with it, so I've stopped working with it for the time being. I paid $148.00 for it, and I expected VI Pro to just work for my money.
Here are some of the issues I've had (everything is the lates version):
1. Yesterday, I loaded VI Pro Instruments (10) into Logic Pro 9.1.1. The last one was my Bassoon (DL version). It made a horrible noise, and wouldn't play afterward. I looked, and the Bassoon looked loaded correctly, but no sound would come. I deleted the samples, and reloaded them. No luck. Finally, I deleted that instrument from VE Pro, then added the 10th instrument again, loading the Bassoon (DL) again. This time, it worked fine.
2. Sometimes, when I save a setup of just a few (6-10) VI Pro instruments, the setup will load, but the Samples aren't loaded into each VI Pro instrument. It's not necessarily repeatable, but this does happen now and then.
3. Also, there are times when some of the articulations will not play.
There's more, but I have gone back to using VE Pro, 64 bit, without VI Pro, just the original VIs.
I would love to use VI Pro for my Vienna Instruments, but right now I really can't trust it. Things are very stable with VE Pro.