Sounds like you are better off with Edge Attitude w/Juice than the Smarty. If you find yourself wanting more power than the 120hp level 5, get the hot unlock code for an additional 180hp. I did exactly that and it was WELL worth the $100 for the code. On top of that I stacked a Striker 2 pressure module. This module offers in-cab adjustability and several different power levels (E, 0, 1, 2, 3, 4 and 5) for up to additional 65hp (same as EZ, but the Striker 2 is a fraction of the cost plus on-the-fly control).
Setting the Juice on #3 and the Striker 2 on #5 gives you the same power as the Juice alone on #5, but with the added low end response offered by the pressure module. With the Juice on #6 and the Striker 2 on #5 you have well in excess of an additional 200+hp all with in-cab adjustability. As you said, you can adjust your low boost fueling so you have little tip in smoke or a TON of tip in smoke all with the touch of a button.
With the Juice on 6x5 and the Striker 2 on #5 though, you can REALLY put up a smoke screen if you want to!
