As far as the motor is concerned I think it's great. Smooth, reliable and strong.
Gauges...Well, I prefer gaffrig for the standard cluster all available at one time, but the smartcraft is awesome!!
You can literally monitor and view dozens of different engine systems and functions that normally wouldn't be available. Plus it has some pretty nify calculators and eta stuff.
Some features include individual cylinder monitoring, temp, comp press, knock, oil press, oil temp, water temp, water press, rpm, voltage, spark, trim, you name it. I was impressed with it when I saw a demo.