A random[1] video on Youtube said that an album with Miku made it to (somewhat close to) the top of charts, which was a little surprising. I didn't think that common Miku tracks were worth listening, but I hit the Amazon, and Next (ver.i) is quite good. Better than even audio in Last Night Good Night, IMHO. Miku is not quite there to displace KOTOKO, but good enough to buy driving MP3s.

P.S. Sadly Megurine Luka does not step up from Miku. They really need to revise the software further.

P.P.S. Hatsune Miku is a rare exception to the normal name order that I accept (it is spelled in the weaboo order on the original game boxes, so I have no choice). The other exception is Rock Lee.

[1] The sequence was: a coworker twittered about Dokuro-chan, so I hit Youtube for the OP to refresh my memory, then "related" rendition by Miku, and then the abovementioned promo newsreel.