FiTech EFI system

Im debating about picking one of these units up. After reading thru this entire thread, I have to say Im very leery. It seems like a lot of messing around just to get it to run correctly. The reason I was thinking of going with this unit is because Im tired of messing around with carbs. Well it seems like there is a bigger risk of getting stranded or not running correctly with this. Like Johnny mentioned you dont hear about the people that are happy with it, just the ones that are having problems. I was also under the impression using the FCC you didnt need to run a return/vent line and now I see you do. My tank is not set up for it and if this is something that must be done then that is even more cost to the system. I guess Im looking for someone to convince me to go with this unit now. Im also curious if anyone has seen an increase in MPG's out of this.