Welcome, Mike.
Some vibration is normal on the "Thumper" engines (single cylinder). If you have someone close by with a similar model, give their machine a quick test drive. I have a Quiet-Line model 800 with the rubber ISO mounts; not too much vibration until the mower kicks in.
The hard-mount styles do transmit more shakes to the frame, seat, etc. Check the motor mounts and be sure they are all snugged to spec. Most of the newer lawn/garden tractors are v-twins, and usually rubber-isolation mounted so those are normally smoother.
Again, welcome to Only Cub Cadets. Put on the coffee, pull up a chair and stay awhile.
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