Has anyone ever heard these speakers by Volti Audio?

That is interesting! The first big upgrade I did was replace the B&C 2" horn driver with the BMS 4592. Greg Roberts used the B&C ×××50 at the beginning but changed later.

The B&C was good but colored. The BMS was a huge improvement in opening up the midrange
to my ears. Night and day difference.

@acman3 

Interesting assessment, and one I believe must depend on the specific horn used in conjunction with the driver + cross-over (added to personal taste). Going by my own impressions of the midrange through the Uccello’s "colored" is not what comes to my mind of its sonic imprinting, but rather I find it sounds relatively natural; indeed the combination here of substance and tone with insight and detail is what gives it a very authentic feel, to my ears. I haven’t heard the BMS 4592 in any configuration, so that leaves room for "evaluative breadth" on my part. I believe Mr. Roberts himself described the B&C unit as a bit warmer sounding compared to the BMS which, depending on who you’re asking, could mean things like more colored and/or less detailed, or conversely even more natural and relaxed? I found Roberts to sound less emphatic on his preference between the two, but of course as we know he favors the BMS. It would be interesting to pair the BMS driver with the specific midrange horn used in the Uccello’s (with a different cross-over), and see how that turns out to ones own ears.

Yes, implementation is the key. I did not mean to imply the Uccello was colored, just that the Volti with the BMS was better, to my ears. 

I also read where one person, when changing from B&C to BMS, on the Volti, sent the BMS back, because he did not like the sound. 

That's why I find it interesting. 

I've heard both the Vittora (at Greg's Maine shop, before he moved to his purpose-built headquarters in Tennessee), and the Rival at AXPONA this spring. Both are terrific, much less colored than Klipsch (haven't heard the Crites modifications, though Greg spoke highly of them).  The Rivals offer great value for money, and you can get resistors hard wired in specially for your amplifier.  They are on the back of the speaker and can be changed if needed without going into the rest of the crossover.  Cabinetry is nice but hardly Sonus Faber class.  You can choose the wood veneer and grille fabric you like; Greg is happy to advise.  He's a nice guy, and really understands what he's doing.

Greg Roberts of Volti is a straight shooter....tells the facts. Likewise Gary Dews of Border Patrol mirrors likewise. I have never heard the speakers outside a Hotel room but they put you at the performance in those crappy rooms so my guess it gets much better with an acoustically treated room.
I owned Gary Dews BP amp. fully loaded 300B driving some past owned Edgarhorns and can tell you they would make a lot of speakers sing. Your amplifiers of choice would have to be very quiet and special to get what you paid from the Voltis but is true with most all speakers. Also would guess the imaging would be my question in a larger room. Would want to hear them in a better environment than the show before I would drop the cash if it were me.

There are plenty of Interesting points here regarding the mid range preferred by Uccello and Vittora going different ways.I would love to and will one day trot off to the UK give the Uccello a listen. Its great that there are small companies keeping the horn flag flying as despite all the anomalies and serious quirks horns, like our ears are the best for music, my opinion, naturally. Wonder if Uccello will ever come to the US to a show or find a distributor, such as High Water Sound? Why not try a bigger mid range cone and larger flare rather than a 2" mid range cone? which seems to be the vogue. Cost maybe?