Still playing around with it, really, but so far it seems pretty straight forward to use. Much easier to 'connect' with a topline in terms of timing, prosody etc when using a vocaloid rather than just midi keys!
Having problems getting it connected up to DAW (Mixcraft and Odesi!) thouh - this might be because I'm still in 'evaluating' (ie free trial) mode rather than buying for 'production' purposes yet. Another problem is that it only exports in midi format (which means it still sounds like keys when opened in a DAW!) or UST format as opposed to MP3 - again, could be due to trial version I'm using.
It's a pretty need piece of software and I'd suggest that anyone who writes EDM or who needs/wants a scratch female vocal should check out the free trial version.