Have you checked out the ms decisions website?
Not only does it have lots of info on the various dmd's but there are also testimonials from different people who are and have been on them for some time too.
Obviously what you decide is entirely your choice but make sure that you're well informed before making that choice - that old saying that 'knowledge is power' is true!!
Many people find that dmd's do benefit them plus there's the possibilty that dmd's may slow down the progression of ms. For me, however big or small that chance is, I'd like a stab at it!
I'm currently on Copaxone myself - I was on Betaferon before that. Personally I'd much rather stick with what my neuro suggests and then make up my own mind from there.
It's your call, but have a good look into it.
Mail me - you have my address