I own the FHI Runways(both the digital and the one with the dial) and I got the EAP flat iron after someone accidently dropped my Runway and the plate popped off(I was able to pop it back into place...thank goodness). That scare created the need for me to have a quality back up. So, I got the EAP Heat on black Friday a few years ago(they have amazing black Friday sales every year) as a back up to my Runways for travel and to allow others to use. It didn't disappoint. The FHI is better but the quality of the EAP is in the same echelon. The EAP handle get hotter than I would like at the hour mark and it has auto shut off at the hour mark but those are small differences. For the price(even full price) and performance, it is well worth it as a dupe. It straightens just as well as the Runway.
ETA link:
EAP Heat 1" Ceramic Flat Iron With three layers of ceramic, the 1" Ceramic Flat Iron evenly distributes Far Infrared (FIR) heat that helps eliminate unnecessary frizzing. Enjoy styles with body, movement, and incredible shine. Temperature Range: 190°F to 450°F
eapheat.com
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The larger ones works well and so does titanium but I usually grab the 1 inch ceramic out of habit.