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Sorry Ghost, I'm normally very polite but that is just utter TOSH.
5.1 is an improved DOT4 fluid with a higher thermal performance, designed like DOT5 silicone based for racing purposes. It should in fact be called 4.1 as its NOT silicone based like 5 is, so totally incompatible with DOT5 !
Unlike oil where cost has a large impact on the performance, NO one on the road would notice a difference on a 250/300cc motorcycle. In fact you'd be hard pressed to notice any difference on a track unless you had a really poor braking system, in which case the fluid would be the least of your worries.
As always YMMV
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