dude it will help, but you could juggle in any other comfortable sneakers, though I don't know if you would reach your maximum potential...
I don't freestyle, I can do like 5 moves or so, but I love to juggle to train my control, and the best shoes I juggle in, are my good old, comfortable, broken in training or playing cleats, with any other footwear, my results are less positive..
Look around the internet, search on youtube what other freestylers use, I'm pretty sure they mostly use football shoes of some sort, though I might be wrong, as I don't have any particular interest in it ....
You freestyle with a football and the best shoes to control a football, are of course football shoes..
So to answer your question: For best results, use football shoes, if your not that serious about it, and just mean to mess around, then any comfortable sneaker will do the job..
to know Him is to want to know Him more"
"i don't know where the limit is, but I know where it is not"
Tocar y moverse y tratarla siempre muy muy bien..'