You can program them with your Massoth equipment..
BUT,
It is not a Massoth decoder, so things are not where 'we' expect, and certain 'nice to have' features on the Massoth, do not work because of this.
Case in point being changing the address:
The 'change address' feature on the Massoth system, changes more than just the address 'value', this is why it fails to a MFX decoder.. As long as you are aware of this, and change the individual CV's, then no problem.
I think it is more a case of it being 'different', having a lot more features (though Massoth are catching up, a little), so things are not where we expect them to be.
We are all so familiar with the way we have 'always' done it, change is hard.