Roller foot yes, no maybe?

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CI have a Juki clone machine with basic walking foot set up. I watch too much you tube and I keep seeing people using a roller foot on leather projects. One area I really struggle with is curves and turns on my machine. I have a servo motor and changed pully which slowed it down considerably but I still am terrible on corners and turns. 

What would be the pros and cons of switching to a roller foot and then small or large roller?

Thanks in advance.