Hi,
I have not upgraded my Vandersteen 5's, but did compare the 5's with the 5A's before purchasing the 5A's. I cannot tell you if it's worth $5,000 to you, but the 5A's are definitely better speakers. They have a better total balance and more resolution, without sounding bright or analytical. FYI, I have compared my Vandersteens side-by-side with Audio Physic Avanti III's and the Vandersteens have greater resolution and pass more information, they just don't sound as bright.
I don't know how difficult it is to swap out the midrange, tweeter and bass module. I think it just takes simple soldering skills... but for $5,000 make your dealer do it! If something did go wrong (highly unlikely), at least he would be responsible.
I have not upgraded my Vandersteen 5's, but did compare the 5's with the 5A's before purchasing the 5A's. I cannot tell you if it's worth $5,000 to you, but the 5A's are definitely better speakers. They have a better total balance and more resolution, without sounding bright or analytical. FYI, I have compared my Vandersteens side-by-side with Audio Physic Avanti III's and the Vandersteens have greater resolution and pass more information, they just don't sound as bright.
I don't know how difficult it is to swap out the midrange, tweeter and bass module. I think it just takes simple soldering skills... but for $5,000 make your dealer do it! If something did go wrong (highly unlikely), at least he would be responsible.