Nice! Hopefully it wasn't too expensive for you!
Lann and Reynn are Experts at AoE damage, and this EX+ brings their longevity up a notch by allowing their Hp+ to give them an extension on their unique buffs, making it much less likely they'll run out and have to use up their abilities to refresh it!
As long as those buffs are up, their abilities will ALWAYS do tons of damage, and as long as enemies are weak against one of the two elements on their abilities (not counting EX since that's single element) they will ALWAYS do weakness damage!
With careful use, they will last you a long while! I hope they are useful to you!
Edgar is a more balanced character, who brings an ability to ignore defense with his EX to the table, so long as he can nail enemies with his special debuff. He even reduces enemy Max Brv and Def for the rest of the party too, meaning he can help sub in those debuffs if nobody else is doing it.
His biggest issue is that his four-hit attacks may leave him with less damage done overall, but that is easily remedied with his high overflow making battery's effective on him! So keep a battery support on tap and he'll perform swimmingly! Funny how most of those are ladies...
Don't feel like you need to fully invest ingots to make these two work, if you only want to do so a little, or have them in your back pocket in case more specialized content requires different characters, check their infographics and make a call!
Here's a fun treat for all you WoFF fans out there! These guys are hilarious sometimes!
Edit: OH SHIT, HAHAHAHAHAHAHAHA!!!!!!
I totally forgot! All those elements they attack with? They imperil those with their EX!!!!
Man, if you missed out on Shantotto, you are gonna LOVE these twins! I think they cover almost every element that Alisaie uses too, so if you are hunting for her, they will pair with her nicely!
Biggest thing, make sure you use them on bosses that are AT LEAST paired up, otherwise they will struggle to perform to the level of other damage dealers. Honestly not that big a stipulation, considering most content fits that description.