I have taken all the drugs except rebif. Copaxone comes in prefilled syringes too. I have had minor injection site problems every now and then but no other problems. I didn't have problems with the other meds either except very minor achiness the day after injection. I have also taken azathioprine, novantrone and celcept with no problems.
Currently I am waiting to get started on Tysabri. I hope I am as lucky with side effects. I really have not noticed any difference between the meds. They must all be doing their job because my rate of active lesions decreased until the most recent MRI. I had been on Copaxone for about 8 years, I think it was just time to change.

Candy