SPEC RSA V10 vs V11

Strongly considering purchasing a SPEC V10 or V11. Was wondering if anyone had experiences with both and would be able to describe the differences they heard. 
 

V10

Natural and speedy sound
Fine signal expressiveness in the mid-high range
Neutral and all-round sound.
 

V11

Natural and speedy sound
Powerful and clear bass
Lively expression

Any insight would be helpful. Thank you.