It does all the cool things Noel said it does.
Please correct me if I'm wrong but IIRC almost all the Waves stuff runs in VST3.
All the FabFilter stuff runs in VST3.
The first DAW manufacturer to use ARA with Melodyne chose to use VST3. Celemony says that it's possible with VST 2.4 too... but it's likely most devs will use VST3 when they have the choice.
There are probably a couple more developers making VST3 plug ins. For example; One of the affordable film sound ADR plugins only works with VST3.
My point was that I found it humorous that a group of users that couldn't use VST3 in SONAR have lined up to post their observation that they don't use VST3 plugins.
It's kind of like if I suddenly realized that I never speak Swahili with the cashier at the Walmart in Tallahassee and then announced that I never speak Swahili.
Au kitu kama hicho.
:-)
best regards,
mike