Some random observations about differences between owning and driving the Si versus the MSM:
* Having owned a roadster, I am now much more likely to drive with the windows down and the sunroof open. It feels weird to seal the car up and crank the A/C.
* Chassis stiffness has improved a lot in the years since the NB was designed. Even my wife's Saabaru feels a tad soft compared to the stiffness of the Civic's chassis.
* Honda's VTEC effect feels a lot like a small turbocharger. The engines are actually remarkably similar in some ways to drive. Both have good torque down low for general traffic carving and both will surprise you in the upper ranges of the tach.
* The Honda only weighs 300 lbs more than the MSM, but it feels huge in comparison. I can't see the hood. At all. And it's very disconcerting.
* Honda's split tach/digital speedo dash design is the Way Forward. It's absolutely superior to the traditional side-by-side set-up. I think you need an analog tach, but the digital speedo is great.
* The Si's seats are lightyears better than the MSM's.
* The Si is a much better daily driver, but there are times when the MSM was pure magic. Those times are more rare in a tin-top car. Then again, I don't miss long freeway slogs in the Miata.
S.