You won't know you need it until you try it
The only shoes I owned before the evolv heras were the beginner mythos....I used to think leather was the best option for climbing shoes and that I would buy another pair of mythos since they fit so well on my extremely narrow feet . After I read reviews I decided to try the Heras as a more advanced shoe.
They made a great difference! the whole surface of the shoe sticks to the walls way better, the heel allowed me to heel hook confidently.
The only issue I had with these shoes is that when I ordered them a Backcountry expert told me that I needed the same size as my mythos (which were size 7 for the heras or 5.5 for mythos) I was told that the shoe would fit perfect after 8 hours of climbing time.
After 3 months wear and suffering (I climb almost everyday) my feet still hurt soooo bad I had to get off a long easy outdoor route before finishing it. I couldn't even stand around wearing them if I wasn't climbing.
I reordered a half size bigger and have the perfect fit!! Just keep in mind these shoes are synthetic, they won't stretch as much as leather shoes.