Go Active Crossover or Upgrade existing XOs?

It's an interesting game.  But I'll bet most arguing about this do not live with fully active monitors or floor standers with a serious front end.

Well done fully active is plainly scary in its immediacy, impact and timbre.  I do run active with ATC 40A speakers and anybody who has sat down for a listen has walked away shaking their heads.

I did listen to the current KEF Blades run properly and was very impressed,  However, the price of entry retail for the set up was closing in on 100K.  I had heard the same pair improperly run with cheaper amplification and they were a disaster.  

The properly matched amplification, cabling and PCs for the amplifiers a terrific investment.  Nearly all of this is taken care of with actives which properly match the amplifiers and eliminate crossover problems.

I might add that my ATC 40 actives came by way of a shop I've worked with for years.  I agreed to leave the speakers in the shop set up for two months before taking possession so that they could expose clientele to them and possibly pick up the line.  

The report was that everyone was overwhelmingly impressed and yet the owner reported customers are not ready for active.  They cannot leave the customary source- preamp- amplifier- speakers template.

Each listener was knocked out, but could not go the active route.

Well from somebody that has always had speakers with passive crossovers, I recently have been introduced to the world of active crossover enables Line Array speakers , and I cant be more happy with the performance, soundstage and overall simply floored response that my ears are treated to every time I listen to them.
   As someone mentioned before , active crossover is mainly used in the home made speaker application, such as my Array system which consists of 28 6.5" woofers and 28 piezo ceramic tweeters in each tower, which were designed and built by a competent electrical engineer (done properly, not a kit per say), the option to adjust and calibrate the frequency, gain of each channel is pretty simple and rewarding to say the least.
    And yes they are bi amped, with A REL sub woofer.
 There are many active crossovers in the market to choose from , dbx, Samson, Ross power, couple older Nakamichi systems and so on, the one I choose offered many features such as phase control for each channels outputs, mute for each ouputs , delay and threshold limiter etc. all using balanced connections but also available in unbalanced versions to match your equipment. All for under $300.

Don't be scared to venture into the unfamiliar, you might be surprised at what you have been missing.
   

Wow, now that was group of very well laid out responses. 
-Millercarbon's point is not something that can be ignored.
Perhaps most speaker manufacturers just don't want people
adjusting the sound they worked so hard to create?
-dicarmeli exposed me for the ignoramous I am in this endeavor.
But I can try to learn about it.
-Unfairlane's point sounds reasonable. I will find out what order 
I'm in. 
-Lewinski's advice is to learn more, then decide. Wise.
-George's work was for naught.
-I like the way Piazanno put it best. Go For it!!!

Correction -Millercarbon's point is something that can NOT be ignored.