The fact that it is digital is much better. The a/f gauges with lines/colors can be quite confusing and utterly useless. Monitoring with a digital gauge is easy... For example if the o2 sensors monitors from 0-1v then .5 is stoichometric.... You can look on webtech and it will explain what voltage means what and your good to go.... You are still tuning with the stock o2 sensor however which has its disadvantages.... This unit was built for exactly what it was built for. On the other hand if you cant afford a wideband (which these days you can get them for just over $200) then you can spend your money on something like this to give your car a semi-base tune.... If I had seen this about 6 I months ago I would of bought it. But now that my tax return is coming back I intend to get a wideband and a laptop and start some serious tuning myself ;-) I am still learning about all this so if I missed something or something was incorrect feel free to jump in!!!