The difference should be night and day. I've driven a LOT. The 335 can feel like it's near super-car levels from a good launch (I've owned 3 Vipers, hence the name) and the 135 cabrio seriously impressed me with its' power. My next car has to be one of the last 128 cabrios, and I'm a little disappointed I couldn't get a 135. As far as 'tighter' goes, it's the same body with additions to handle the increased power. Maybe the 328's you've driven are sport package with sport suspension (there is a difference) and the 335 didn't include anything? It could also be the tires.