For me, the fuller - the better. Most regular sized plugs just don't have enough mass and size to really apply pressure to my P-Spot. It's unfortunate that Eden Fantasys doesn't carry this type of plug, but I have talked myself into trying one. WMCBP
I've tried other toys and objects, and I've noticed the longer I have stimulation and pressure to my P-Spot, the strong my final orgasm is with that toy/object. Considering the weight of the WMCBP as well, this should surely do the trick. I particularly like the idea of being able to close up nearly completely, which is not possible with most plugs and toys.