It's basically the same.
I would say its more comfortable with the poly now. The vibrations are about the same since the stock ones were so sagged to the bottom the damping was pretty much gone. The difference is that there are no more vibrations and weird bangs and noises under hard acceleration and you can feel that everything is much more solid. So in that case, it made it better. If you have something rotating in the drivetrain that is out of balance however (like my LS1 driveshaft), you will feel that a lot more haha.
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