Just wanted to add, that you increase your chance to crit from 5% to 9.75%, and your chance to critically miss is reduced from 5% to 0.25%.
If you take a fighter (Champion) with level 3 the crit chance would normally be 10%, with advantage it's 19%.
And it gets really funny if you play an Elf and take the feat Elven Accuracy đ
I donât think we will see elven accuracy in BG3 with current height advantage. It would be hilariously overpowered.