Has anyone ever heard these speakers by Volti Audio?

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?

I normally don't post but have to chime in on this thread. I'm stilling laughing from the previous post about "prying them from his cold dead hands". I have used that exact same wording in talking to Greg at Volti. I have the Alura's and absolutely love them. I first heard the Vittora's at Axpona and fell in love but quickly realized that they would not fit in my 13'x13' room and more importantly I couldn't afford them. But they sounded great!  So Greg suggested I go hear the Alura's in another room. So I did. And bought the speakers at the show. 

Since my room is small it took some dialing in of the bass (these things do bass!) and lots of moving of the speakers. And these things are heavy so it was a chore. But I regret none of it. I love these speakers. 

I travel A LOT and have visited lots of high end audio stores so I get to hear lots of speakers. I have heard nothing that comes close to making me want to change. And I've listened to very high end speakers. 

Greg is first class to work with. I can certainly recommend Volti.