I have no experience of the Scala so cannot comment, but what I would say is that I went the Autocom route and have never looked back.
OK they are not perfect IMHO but everything I have ever tried to do has always worked, it seems that anything you want to connect to it can always be done because they are so popular and have been around so long that everyone makes some kind of connection kit.
I bought a new helmet camera the other day and it turns out that there is a lead that the camera manufacturer makes to record audio straight from the Automcom.
As I say, the Scala might be superb, I don't know, but I do know that I would change from Autocom personally.
[Edit]. BTW, you might get more responses in the Bike Communications section.