Next time you're playing a 4 hero who struggles to clear camps and waves, if you see this item, pick it up and stack a small camp a few times (edit: it pushes lanes too, people). The 20 reflect damage rips through creeps. On a hero like Undying, it feels like it doubles your clear speed and lets you get your important items significantly faster. I've ignorantly avoided this item on supports for a long time despite it being similar to a Philosopher's Stone when used properly. No longer!
That is all. My apologies if you were already aware of this. Good luck.
Edit: Just in case this needs to be said, don't take neutral items or CS from cores with priority. Play your role!
Chain vest has existed in its current form since season 5, giving 40 armor for 800g. Bramble vest gives 35 armor, reflected damage on autoattacks applying grievous wounds and, with this season's item changes, bramble vest had its cost reduced to 800g.
Assuming that 1 point of armor costs 20g, this means that the reflected damage and grievous wounds passives together come at a cost of a mere 100g. For reference, upgrading a long sword into executioner's calling costs 450g for 5 ad (valued at 175g) and its own version of grievous wounds, which costs 275g.
While the bramble vest doesn't allow you to apply grievous wounds to any champion that isn't attacking you, it does stonewall lane against any sustain-based champions, usually in toplane. Any champion can rush bramble vest into viego, fiora, irelia, renekton, etc. and become impossible to fight.
My question is, why is this item so cheap? Executioner's calling gives good value for its price but it delays the spike of bruiser or fighter champs that buy it. Bramble vest is 87.5% gold efficient without its passive and makes any tank who plays properly impossible to fight as an auto-attack based champ.
Obviously bramble vest needs to exist in league today where half of the champ pool can heal their full hp bar off of a minion wave. But surely its price tag should match its power. I personally believe that if bramble vest built out of 1 cloth armor and awarded 25 armor, it would still be a strong item for 800g.
I see two different paths of defending it.