There are can be alot of problems with these set ups and the trottle respnse differs from brand to brand. My sentra is fly by wire and the response is great and very quick but, at work Ive noticed some of the toyota and chevys have a noticeable delay in throttle response. I have had to replace all 3 compnents in my throttle system in the four and a half years Ive owned it. Within the first year the throttle pedal sensor wnet bad, which requires replacing the pedal assembly. And last year the throttlebody went bad and wiped the ecu out with it. I get discounted pricing on parts so none of the repairs were all that bad. Stick with throttle cables. The only plus side I can see to fly by wire is that the cruise control is all run through the ecm (atleast on my set up) and make things a little cleaner/ simpler under the hood. The other downside is that alot of fly by wire cars do not give you 100% throttle open when you mash the pedal but, instead only open the throttle plate as much as the ecm has calculated that it should for that rpm/ load. Shits ghey.