That G6 sole is grippy! I'd say almost as grippy as most vulcs, so solid for a cup. Not slippery at all and that's from skating KSL G6, Wino G6 Slip Cup, and Reynolds G6 (all use that sole).
There's also not a huge disconnect in boardfeel that a couple others experienced (which I personally don't believe they experienced. They just weren't used to cups at that time, I'm sure)