Razor's handlebars are well-padded, but their mainstream models rely on hard plastic/resin materials for the wheel and only include shock absorbers on the higher-end models. It won't be too bad in parking lots, but older asphalt is pretty noticeable and you can feel the expansion joints in concrete sidewalks.

Other models sometimes include larger soft-rubber tires that should significantly reduce this effect. I've not tried them myself, though, and for some basic physics reasons this tradeoff will likely reduce speed and increase expended effort.