the substance has a big and bucking type of pop, tracks well (too well, it's a bit grippy), lands hard and super slow.
the marius suprisingly has a bucking type of pop, too, but nowhere near as abrupt as the substance. it tracks well and can be broken free easily. it's slow when ridden flat out in the flats, but once on edge, it goes. the landings are some of the softest, if not the softest, out there.