It is expensive, maybe even overpriced, but it is good oil.
A real synthetic oil being Ester based, a group V, not something that can be said about other oils which are marketed as being 'full synthetic'.
Being a real group V they require less friction modifiers, great for engines which share oil with a clutch. There are other oils which are great that are not a real group V, or even IV, they use a lot of friction modifiers, this isn't great for a wet clutch.
Is there double the price worth of difference between motul 7100 and 300v, probably not, but I'd definitely prefer 300v if I can be stuffed changing the oil regularly enough.
GSXR = The go to thrash bike