Replying to Armada JJs, Royal Family Bindings

What's up everyone, I asked these questions in another thread but it was at the bottom and sort of unrelated so unsurprisingly hasnt seen any action.

anyway, i'm looking to get some rockered powder skis and am pretty interested in the JJs. so a few questions...

1) if im around 179cm, i should def go for the 185s right? do they ski short or long..my guess is they ski short for obvious reasons, and i should definitely go 185

2) have the JJs changed over the past few years? if so, how?

3) any advice where to find some for sale (used)? not having much luck here

4) ive always used look pivots, so i dont know much about recent bindings. can anyone give me some info on the royal family of bindings? ive used a pair for a day but dont know much about them

thanks dudes