We use mfs2, as it´s been called in former times, from the very first beginning on
As far as I know SAS is changing to this system now, THY changed 1 or 2 years ago and if you are still interested you should talk to them and probably also to the guys of former fwz in Vienna...
Anyhow, what I´ve learned over the years is, that with every new system you buy and try to integrate, you´ll be some kind of beta tester
Support and callcenters of providers nowadays are evenly distributed around the globe for H24 coverage but often they lack of evenly distributed quality...
cheers
Andy