efi is awesome. it makes the engine run much smoother and more efficeint.
the only drawbacks are you have to replace the fuel filter alot more often and you can't jump them off if the battery goes dead since it will mess up the computer system. i'm not sure how much those fuel filters cost for the efi models. they say to replace them every 200hrs. i guess you could wait and do it every 250hrs and be ok. you can go 1000hrs on a carb engine before it needs to be replaced. i bet the amount of gas you save is spent on fuel fitlers so there's not much difference.