This is an odd one because Apo works differently for everyone. I started on the Apo pen several years ago, then moved on to the pump. Was also taking Pramipexole, and Sinamet at the time. Funnily enough have come off the pump only about 10 days ago because it seems to no longer suit....very long story, I had to come off the Pramipexole because of OCD issues, and things have never really balanced out since.....
Couple of things, does hubbie have an Apo nurse? (not a Pd nurse, but a nurse from Britannia, the drug company?). I had a dedicated nurse, she was brill, very helpful. If he does not, get in touch with your Pd nurse and ask her to put you in touch.
Did he use a pen previously? If so, was this successful? If the pen worked, then the pump will work better, but will take a little getting used to as the dose is constant. If he's gone straight on the pump without ever using pens, this will be a jolt to the system I guess.
Has his nurse adjusted any other meds? At every point where there was an increase in my pump, I felt quite a profound difference. It's early days with his pump I guess, but if he is already using other DA's, then maybe over time these will need adjusting.
Ask the advice of the Apo nurse would be best thing. I can only relate my own experiences, but if you need any further advice feel free to get in touch.
All the best,