I've had IVSM twice. Once without a taper (the first time) and once with a taper.

Having a taper made the crash from the steroids a heck of a lot easier to deal with. I got really sick the first time I had IVSM when the crash hit. (barfing sick)

I was still really tired and crashing a bit with the taper, but it was easier to deal with. Didnt get sick those first few days after I finished the IVSM. The second time I had IVSM, I pretty much begged for the taper.