The Smoktech clone of the Vivi Nova (Titan and Screw Tanks) uses polypropylene tubes, safe to use with problematic flavors. There have been reports that the plastic mouthpieces have melted with contact with some juices, though. Considering that the Vivi's probably use the same plastic in their mouthpieces, it's another thing to keep an eye on, not just the tube material.
I have Highbrow's Orange de Sangre, it's a great flavor. I use it in either Smoktech polypropylene DCT tanks or IBTanked pyrex tanks.
This juice is not on the current on-going list of juices that can crack or melt plastic. YMMV, though.
http://www.e-cigarette-forum.com/forum/tanks/219179-lets-make-list-juices-flavors-crack-tanks-ce2s-clearos-29.html#post7203876