At least for me it seems like it takes too much effort to run out of stamina at high levels. Maybe it's because I don't solo much (it gets tiring), but it took me hours to use it all up, and I only did that once.
At first I tried other characters for variety, but never got into their gameplay much. And it takes too much money for an endgame character, so I could never play for too long with an alt.
Infinity Sword looks more like a girl than Elesis.
Since she's copying Elsword's classes, is the third one going to genderswap too...?