The baclofen pump CAN be very helpful. I have had 13 years experience managing patients with pumps. The reason it is a benefit is the way it delivers the medication - which is directly into the fluid that bathes your brain and spinal cord (CSF).
Most medications are in pill form, which must be processed by your body's organs and the small amount left over is picked up by your bloodstream and circulated to your brain. This is why most people taking baclofen pills are either awake with spasms , or asleep. It is a very sedating medication.
You need to be working with physicians and nurses that have lots of experience with pumps. The pump can be programmed to give you just enough medication to relieve your spasms, yet not remove all your 'tone'. Spasticity tends to make you stiff, which is something that can 'hold you up' so without any spasticity your muscles must do the job by themselves. As muscles loose their 'message' from your brain to work, they become weak. So you can either be like the Tin Man in the Wizard of Oz or you can be like a bowl of cooked spaghetti !
The Baclofen pump can keep you right in the middle, if managed properly. Hope this has been of some help. Feel free to ask me questions. I will do my best to answer them. I am not a pump pusher, I just have experience with the good and bad of the IT drug delivery systems - called pumps.