go the s300 if you want hondata. from what i understand pretty much any decent tuner with a laptop can tune it (plugs in with usb)....so you are not restricted to 'hondata' tuners like james.

s100 is the base unit and you are more restricted as to who tunes it.

having said that i've never heard a bad word against dynodave's work, other than he's so busy he can be hard to reach sometimes.