I like my $100 pair of Black Diamonds, but the differences between a $20 pair and a $100 pair is relatively minimal.
Flick-locks are definitely the better design in my experience.
I think the consensus is that the antishock features are a gimmick. I have two pairs of poles, one has them one doesn't, if For some reason I needed to buy a new set, I would buy one without the feature.
Rubber tips seem to also be another gimmick, the carbide tips are much more trustworthy in my experience.
Most expensive poles have 3 main handle options, rubber, cork, or dense foam. I like the dense foam the best, most people seem to prefer the cork, nobody seems to love the rubber ones.
I use aluminum and don't trust carbon fiber. I simply abuse my poles too much banging or rubbing them into things to trust anything short of metal. Someone will likely chime in to disagree with me on this and their opinions will probably be just as valid.
There are only minor differences between Leki and Black Diamond and both are top notch. Personally I prefer Black Diamon poles, so lkng as they are the standard or light strength models (stay away from their "ultralight" models). Leki supposedly has better customer service. I like to joke that Leki owners say "Lekis are great, when my poles broke the company fixed them for free." and Black Diamond owners say "Black Diamond poles are great, I have no idea how their customer service is because the poles never break."