Well u cant expect much from a sporty build Sedan and it comes with a large 18" RIM which I think contribute to the bumpiness.

I drove an accord 2.0 from end 2009-end 2011 then bought my current Mazda 6 2.5 around 5 mths ago. I knew my accord very well. My mileage is 130000 km in 2 years of driving. I tuned it up with emanage, twin exhaust system, k&n, etc, adjustable suspensions, bars and many more.

I test drove a 2.4 accord too before i bought my 2.0 as before I buy my Mazda 6.

So, here is my personal view:

1) it is no fun driving an accord compared to M6 2.5... Accord lacks of the sprinting feel. M6 2.5 is damn responsive.

2) accord handling is damn good. I hate my M6 when I hit corners at high speed. I did 20 min from The Mines to Setia Alam nearly everyday cause my gf and my house is far apart. When at high speed corners, M6 steering has free play and can be dangerous.

3) Top speed. I dont know about 2.4 accord. My mazda 6 can hardly go above 200kph. Internet say something about throttle respond delay. My 2.0 accord with piggyback tuning, reaches 220 effortlessly. I have booked dylan from Dktuning.com tomorrow to reflash my ecu and unleash the true potential of M6. Cost is about the same as piggyback but reflashing is much more better than a piggyback.

4) I agree parts are easy for accord. M6 is very little. I only know Speedworks has extractors, kakimotor has bars and even K&N drop ins for my M6 2.5

5) The looks. I never get boring with my M6. But M6 sometimes makes me feel like driving small car. Dont know why.

Tomorrow dktuning.com gonna tune up my M6... I will have a dyno first before that and another dyno after that.

i had a test drive with mazda 6, seriously powerfull and responsive.
with the price range, you get keyless entry, startup which you wouldnt find in camry and accord (still with key)
i like the dual zone condition, seats and handling. aluminium paddle looks cool and paddle shift, sunroof were fantastic.
solid door, and pretty silent overall. havent had a chance to test the bose speakers.

i suggest you test drive the car, it is really lovely. i couldnt believe im driving a mazda, and i feel like driving a smaller car. because it of its agility and reponse.