Smart carb is like $650. And pretty sure that tanked already.
http://www.motovox.com/smartcarb.php


It is just a lectron carb reworked. Was billet, they were working on a cast one but that failed.
You still have to jet it at first (and jetting a pwk or TM carb is very simple). The smart carb just allowed you to ride in a wider range of elevations and temps without rejetting.