I had Mitox coming up to 2 years ago. 1/2 way through I started Copaxone injection. I had it as Rebif stopped working for me. Unfortunately (for me) I had a big relapse just before the 3rd lot of Mitox, which took me alost 18 months to get over. I still carried on and completed the rest of it though.
Since then I've had a couple of smallish sensory relapses but not big horrible ones like I'd had before. When I was first diagnosed I had 5 relapses in 6 months and when Rebif stopped working I had 3 in 3 months, so something must be working for me. I often feel like the Mitox didn't really do much for me and it's actually the Copaxone that's working, as I have lots of things that effect me on an almost daily basis (wobbles, memory, fatigue etc) but, I don't know if it's just that I expected a bit too much from it. My neuro said that these are things that I may just be stuck with as that's the nature of MS and as long as I'm not relapsing all the time, it's all doing it's job. Of course, unless I stop taking Copaxone, I won't know if the Mitox did anything and I'm not really willing to test that out.
I was given the choice of Mitox, Tysabri or Campath and I now wish I'd picked Campath (Tysabri scares me more) but I'm not going to beat myself up over it, it works really well for a lot of people (my neuro said I was very unlucky that I relapsed after starting the treatment).