I was started on Cellcept within 3 months of my dx in 2000. My neuro checks liver function every 6 months and so far no problems.
I do think the Cellcept helped within 3 months when I first started. I am now on 3000 mg/day which is the max dosage my neuro will consider.
I haven't had any side affects or problems that I am aware of. I would hate to think where I would be if I stopped it since I do believe it is helping.
One other thing, at least they have a generic form now. When I started, the cost was about $1,000 for a 50 day supply at 2,000 mg/day

My insurance had a max at that time of $1,000/prescription so I had to get it refilled every 50 days instead of every 90 days.
The generic is a lot cheaper and I've been on it for about 6 months with no problems.
Good luck!