I have no idea where I first heard of Shark Wheels but I backed them on Indiegogo and received my 60mm orange wheels last week. I have since taken them out around town in Cambridge, MA commuting to the Harvard campus and generally just joy-riding. Here is my review!
I think the standard Penny wheels were 60mm, but I had a hard time riding over the mountainous terrain that is Boston. The sidewalks are musical sequences of ridges and cracks as well as the occasional tree root just busting up the concrete like it ain’t no thang. The roads aren’t much better–large gravel/stones galore, cracks, potholes, etc. A lot of Boston-area sidewalks are actually brick, so it gets pretty bumpy. All of this made me think “I would love a smoother ride”, so I got bigger, soft wheels in the form of Cloud Rides, 66mm, 80a. They stuck out a lot more on the sides and I had to get used to that (read: I would hit the wheels with my shoe sometimes and get my own sort of wheel-bite). However, they did feel much softer and smoother, and I enjoyed riding around town all last summer. They held up great, too.
I came across Shark Wheels and was mostly captivated by the claim that the wheels actually flick rubble aside rather than just try and mow over them like a standard wheel. This would theoretically help the skateboard ride over road blemishes more easily as well as providing me with a smoother feel. With another harsh winter gone and the freshly scarred spring roads for conquest, I decided to give them a try.
I freaking love them. Even though they are much smaller than my Clouds, they really do go over bumps and rocks more easily. The first afternoon with these wheels and I felt much more confident approaching obstacles. My usual “ready to jump off at any moment” attitude began to wane.
I can’t speak to the slide as I never learned how to do that, sadly. But I definitely enjoy carving/pumping up and down driveways and obstacles, and pedaling full speed down the streets. They still bow once every few blocks to a harsh sidewalk ridge, but the overall riding experience has been great.
FYI I ride a Penny Nickel board with Reds bearings and Bones soft bushings, with griptape (I don’t understand how people ride without–the slightest moisture on the board/shoes and your foot will slide right off!). 
tigressara 