Yeah, they're full slicks. No thread whatsoever.
The Hanks are dual compound, which means they wear more evenly and roll with surprisingly little resistance whilst providing extreme amounts of grip when cornering.
I've taken them to (and over) the limit quite a few times, and they really let you know when you're nearing the limit. It's hard to explain really, but you feel a sort of vibration in the handlebar and frame, as if they are skidding a few millimeters and then regaining grip.
If you're a complete lunatic and keep pushing, that feedback becomes stronger until they gradually lose grip. So you (usually) have time to detect the slide beginning to happen, and time to catch it when it does let go. Of course a sudden loss of friction (oil or sand on the road) will catch you out, but that's the same with any other tyre really.
The Schwalbes that preceded my Hanks gripped one moment, and then suddenly they lost all grip completely without any indication. That's not the kind of behaviour you want on a bike you ride often.
In the wet the Hanks slide as easily as any threaded road tyre, but there's no need to fear for aquaplaning like in a car.
A bike and rider may weigh a tenth of a car, but the contact patch is less than a 25th of what a car has and it's oval instead of square. So even at 25MPH or more your weight is still pushing the tyre through the water film and onto the road.
Threads on a bicycle tyre may fill up with water and push it to the side, but they don't make the road on the contact patch dry, so they don't really provide extra grip.
Maybe there would be a difference in grip level at higher speeds, but at the speeds a bicycle achieves it's not really measurable.
As an added bonus, I find that a slick doesn't pick up as much water as a threaded tyre's grooves, which means you get less spray on your back if you ride it in the rain without fenders.
On snow and ice (yes, I use them in the winter too) the grip is very limited indeed. However they provide enough feedback to let you know where the limit is and how far from that limit you are. I had a few slides on snow, but always had time to react and as a result I haven't had an off so far. (2 winters so far, third coming up. Around 500 miles done in winter conditions)
I'm pretty sure that knobbed or spiked tyres would make me faster in the snow, but because I don't know their feedback it would be harder to judge where the limit is. I'd be more likely to fall with proper winter tyres than with these slicks.