My Isonic 111 had a wider tail and more power than Futura 133 my partner used. There are quite a few differences between the Isonic and Futura, eg. you'll find it more diffocult to get your foot into the back strap of the Isonic. I would urge you to try an Isonic before going down that path, it could avoid a lot of frustration in your progression with speed,
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