I am fairly new at trying to milk my prostate.  At first I bought the Renegade II.  While many people thought it was too big for a newbie, I found it lacking.  Plus, you can't really have an in and out motion due to the multiple shapes of it.  I then bought a Patchy Paul vibe since it is a big bigger and a G-Spot vibe.  Now it takes a minute for me to get used to it but when I do, I can turn the vibe on and try to find the right spot.  I honestly haven't yet really found my P-Spot but when I start with the in and out, slow working toward pounding, the "milk" really starts flowing!  I guess I could say I am a fan of the pounding, well my prostate is anyway.