Holtzman has come out w/the Automatic Temperature and Altitude Carb Compensator. I can't find enough info yet to determine if this is better than the tempa flo device. I went to Holtzman's website and still can't decide. Any input on either item would be appreciated. I know sled-head plans on using the tempa flo this year. It sure would be nice to not have to mess w/the jets when the temp changes.