I see 0 point to skins on the D3 when the docks have removable inserts to work with cases. Unless you are a person who hates the extra bulk I guess... personally I'd rather have the Qmadix case that will protect my phone when I eventually do drop it (everyone will drop their phone at some point), will fit in the OEM docks and comes with a nifty holster.
With that said, yes the Skinomi screen protectors are pretty boss. I have a zagg on an OG Droid that my wife used to use and omfg that thing is a piece of chit. It fits well but it is sticky to use whereas the Skinomi feels like it isn't even there and is way better than the garbage dry apply protectors that scratch in 2 seconds.