Känns nästan jobbigt att skriva på engelska men men de blir väl irriterade annars..
I don´t have any experience but i´ve seen this been discussed a little bit in another forum(swedish)
The only thing they have mnentioned was some problems that were present a few years ago with cpu´s that crashed/stalled sometimes.. And that they doesn´t support all siemens hardware (special modules)..
But if you are thinking of using Vipa products all the way this would probably not be a problem..
This is a good idea i encounterd so many problems using VIPA and other products that we decided to skip them and use Siemens only. But they have really fast and cheap cpu's.