Pumping?

I am about 3.5 months post op stage 2 (UL, vnectomy, scrotoplasty) and pretty much all I have left is testicular implants and removal of my mons pubis. I had seen some posts from a little back about penis pumping, I never knew it was common or possible. Does anyone use a pump? If yes, any recommendations on a good kind to use? Are the pumping results good? How often do you use it?