I was actually researching what the difference between the s200 and s300 and I found out that there isnt much difference on between the 2..

heres the information i found about them it made my decision easier on what to get hehe..

Hondata s200
The s200 ECU builds on top of the power of the s100 and add’s features to enhance the users experience. The extra features of the s200 delivers is as follows:

Data logging – The ability to plug up a laptop to your car and use the Hondata Logger software to record absolutely everything your car is doing with regards to the operation of your engine and all its sensors.

Launch control – This gives the ability of the ECU to control how you launch the car from stand still. The ECU will hold your RPM at a user definable point lets say 3000rpm and you can apply 100% throttle and your RPM will not increase above 3000rpm. This allows you 2 concentrate on your clutch engagement and letting the RPM be controlled by the ECU.

Full throttle shift - This gives the ability of the ECU to the driver to keep his foot on the accelerator 100% during a shift of gear, i.e when your racing and your driving flat stick and its time to change from 2nd gear into 3rd you would take your foot off the accelerator, push your clutch in, change gear, let your clutch go, and get back on the accelerator.
With full throttle shift you keep your foot on the accelerator, the Hondata ECU controls the RPM of the engine and all you simple do is clutch in , change gear and clutch out your foot never leaves the accelerator. This works very well for forced induction cars as it keeps boost levels constant totally removing turbo lag between gear changes.

and the s300

Hondata s300
The s300 ECU is the new generation of Hondata ECU’s it combines all the features of the s200 and add the important element of data logging what your car is doing with out having a laptop plugged up. The s300 ECU has internal memory which will remember what your car as been doing, this is particularly important for drag racing or track cars when you can’t afford to have a laptop flying around the car whilst racing. The s300 still has launch control and full throttle shift. The s300 also user’s the latest management software called sManager.

im actually gana go for the s300 due to that ecu internal memory makes everything easier hehe..

hope that info helped cause it helped me