Dynamat and thicker mats do help, also you do actually get used to it, it's a lot worse on certain road surfaces, the tyre type/make makes a big difference aswell
It won't handle quite like a clio due to weight and wheelbase but it has very sharp handling and is very chuckable ( I know as I have a Clio and a 370)
It's certainly not a chore to drive, I find it relaxing whether pushing on or cruising
Warranty ? This is a tough One, I bought within the warranty and haven't needed it but I do like the connect premium which came on later cars