User blog comment:DaughteroftheforestCourt1/Megurine Luka V4X Reactions/@comment-5051846-20150308194002

Luka V4 has had a free trial released. Her being bad is not a rumor, it's also not hard fact; it's people's opinions. This is a selection of what fans have thought upon using her.

It's not something you can prove or disprove, anyone can download Luka V4 and see what she's like, if they wish to. :D

'S not what you would categorise as 'rumor mill', it's reactions. orz

Anyway, for armchair fans like me who don't use Vocaloid; the consensus is pretty easy to work out. The majority of people are disapointed with Luka V4 and many flaws have been reported, therefore she's probably not very good on the general scale of Vocaloids. However, as with everything, there are a couple of people that enjoy her. Therefore, if I were to offer guidance on whether to buy her, I would say try her out if you are really fond to how she sounds.