I played with Poly Tour Spin this weekend and really liked it as well. Very good spin( and I'm not a fan of shaped/textured strings ), control and power. Comfort is OK, but much more comfortable than other stiff strings. It's quite an interesting string, because it performs similarly to other great ones that are considered stiff but it's much easier on the arm.
Tension stability seems to be above average for a poly as well.
I just don't dig the color. Yonex should make a silver/grey/black/white version. All this blue doesn't go well with the Prestige
2 Yonex VCore Tour G - Kimony TecniLeather grip / 320g unstrung - strings TBD