Much stronger overall. The cover is very strong, but the core dynamics keep the motion in check to make it more versatile.
That's what I was hearing as well. Definitely stronger than the IQ Tour, but more controllable than the IQ Tour. Even with surface, the IQ Tour would still be a bit weaker than the Envy Tour. JR Raymond stated in his review that he is keeping the Envy Tour in his bag, because he doesn't throw the IQ Tour anymore due to the weak cover it has, and that Storm would have to tweak what they are doing to make something comparable.
Personally, I'm looking at both this and the Widow 2.0 Hybrid as I'll have room in the bag for both. I need a decent controllable ball that wouldn't require the soup to throw (yes, I'm looking at you, GB4), and this fits the bill perfectly.
BL.