Fenn Glide vrs v14

Usual type of question
Much difference between these two ski's.
Flat out speed difference
Speed over long distance, much difference?
Is the extra price for the V14 really worth it.
Its for a flat water race craft.
I have a original Uno, is it worth changing?

Also another question. It's not a bagging just wondering really.
I see a lot of Glides for sale. Are they living up to expectation re extra fast craft compared to the old Elite or SL Elite. Don't see many V14's for sale. Why?