Hi and welcome to NeuroTalk!
Whether or not to take a DMD.......that's the $64,000 question!

For some folks it makes a huge positive difference. Others it doesn't. The only way to know how you will respond is to try one....or three! I tried Copaxone and Betaseron and could not tolerate either. I'm taking LDN now and tolerate it well. Not too many folks cannot tolerate LDN.
For me, personally, the side effects from the DMD's were just not worth the small percentage they offer in reduction of progression. It might be more worth the side effects if they had a better track record. But, just like MS, it's an entirely individual thing.
Do lots of research and ask lots of questions. You'll find some great support here and lots of experience.