Got Avanna...the english version basically, too ;)
Japan has entire charts dedicated to Vocaloid music. Over here it hasn’t caught on as it’s hard to program to sound really good solo. The English language with all its details is a lot harder than Japanese...but it CAN be done. When Yamaha gets the software more user friendly, it will rule. No ego chick to deal with and 3d imaging is totally real now.
The Japanese language lends itself almost perfectly to Vocaloid, but yes, once the software gets more user friendly, and more English-language adaptable (and it will), like you said, no more divas. LOL!