I haven't been on Imuran, myself, but I know others have and have made posts about it. Someone who has experience with it will let you know if it's worth it. But in the meantime, maybe try going through some of the threads in the 'medications' forum. I'm sure I've seen some in there about Imuran.
Hopefully, it ultimately ends up being worth going on so you can cut medication costs (they can get really expensive when they start piling up).
Hugs and spoons
Medications: CellCept, Plaquenil, Prednisone, Naproxen, Tramacet