Harbeth P3ESR Anniversary edition. Worth the Upgrade?

If you read in to that review, or what I took from it was.... The Anniv edition was only marginally better. At one point, he could barely distinguish a difference. On the other hand, after putting them on the TON TRAGER stands, he wanted to put the Sound Anchor stands to the curb. I know what I'm thinking for my P3's, and its about those wood Trager stands. 

Definitely reaching the laws of diminishing marginal returns. A $600 upgrade for a ~5% improvement. No doubt these will be collectible though and hold their value.

Does anyone know what the crossover point is? I’m guessing it’s pretty high with that .75 tweeter. 

Also, why is the tweeter and driver spaced so far apart? I’m sure there is good reason, its just an uncommon design decision. 

I have not compared the two models but I do have the P3esr 40th anniversary pair. I use them in a second system. They sound much bigger than they are. When I first got them I put them on a 24" pair of two column metal stands that I already had. Sounded great. Later I bought a pair of the Tontrager stands. They are very well constructed and finished. The sound opened up became more musical. I know that may seem nebulous and subjective but that is the best way I can describe it.

I rarely hear of folks using these with subs. The sealed box would be easier to blend vs a ported design. 

What do you mean tweeter and driver spaced so far apart? What do you mean uncommon design decision? I use mine with a sub with great results!