Can't speak as to price, but for any of the curious: this model, and the smaller "international" size, is the only modern Parker pen even worth bothering with, let alone looking at IMO. Every other model still being made today is either a generally mediocre import from their Chinese factory, or the Sonnet which has suffered from dryout issues since it was brought to market in 1994 (yes there are collectors online complaining about this still!).
Get them while they're hot, as you never know, the next iteration of duofold might be worse (pretty much the going pattern for the former big three great American pen makers: parker, sheaffer, waterman).
The red model has the barrel imprint as a homage to the original Big Red.
Also note that though these days only fine and medium nibs are available to buy in store, you can use Parker's nib swap program to swap your unused nib for something perhaps more interesting (they have a surprising range available, for now anyway). Again with the nib swap, get those speciality nibs while they're hot, as the going fare these days for many manufacturers is simplification of nib range to "just" F, M, B.
Centennial model have nice balance in the hand for me. Comfy to write with for long periods.