You can see a Carvestik in action at this addy:
www.carveboardsports.com
They are not agile enough for TS, but could no doubt make most Hybrid courses, and GS as well. The 'trucks' don't have tensioners llike Seismic does, and the stock steering angles would make it tend to slightly 'oversteer' during aggressive slalom. Wes, the wheels are NOT hard nor slow, They're BIG + GREEN on that board! The DaKone wheels that are standard for those do have an odd shape, but it suddenly makes sense when you see how steep the steering is on these. I like these boards as crosstrainers for snowboarding, as you actually 'get up on edge', more so than is possible with normal longboards or slalom boards. However, the steering 'looseness' is an issue for going fast. It's best that you don't go too fast on a Carvestik, but rather enjoy the Surfing/freecarving aspect of the ride.
The Teirney Ride pictured is another good Snowboard crossover board, but has only two wheels. That photo is of a Snowboard Racer doing some crosstraining drills during the warm, dry months. The gates used are not quite right, but you can't really set stumpies in the road! Tierney's are suprisingly stable at speed (no wobbles), but a bit hard to ride a slower, pedestrian speeds. I like those with the Rubber tires Vs. the Urethane, as the level of grip makes the inherent tippiness not seem so bad. In tipping in, beware of the deck's width; I took a good hard fall by augering the corner of the board into the pavement mid-carve my 2nd run out on one. I'd love to see a better deck shape from them, and maybe slider-glove material along the rails, just in case.