>>546024842
It's not bad, just please don't think it's going to make you do almost x2 damage, it's way less.
Also that DMG bonus is literally everywhere, not only echoes. Here's my Anko with normal rotation buffs for example, you usually get over 100 quite easily. Not only that, but this bonus is also additive with attack type damage bonuses (like Heavy DMG, Basic DMG, Liberation DMG etc) and you also have plenty of those too.