5oo Nitro,
as I see it this scope provides three new very useful features:
- a magnification range from 1-6 X, which is all you probably would need for a double rifle
- a very large field of view
- up to 4,7 " of eye relief (the EE model), makes it safe also with heavy calibres

In this case I think Swarovski has made some genuine improvements.
Pricing is a different discussion, but I don't think you can compare the "prestige effect" of a $1500 scope with that of a $150.000 H&H rifle.