Yes, I have seen a number of small improvements (so has my physio) in less than 9 months.
Starting from EDSS of 6.5, I did not expect a major improvement.
However if it does not work for you, then it probably won't. Most medication is like that (boo, hiss).
Still, if you are SPMS, what else is there to try except some of the off-the-wall treatments.