What Exactly is the FFF Cylinder Head and Why is it so Good,

[SHARKBITEATTACK]

So I always hear people talking about the FFF1 and FFF2 heads for the speedsix. I've established that it means finger follower free and that it uses buckets instead. Why is this good though? I was under the impression that finger rollers were the best compromise for low inertia and reduced wear allowing high ramp cams and high rpm? For example the BMW S54 used finger followers where as the other inline sides of that era used the conventional buckets...

Was this cylinder head initially something developed by TVR or was it always an aftermarket item?

Any other things that make this cylinder head superior? Flow rates, valve size, heat dissapation, VVT, chamber design, weight etc.?